Abstract

We report observations and analysis of high harmonic generation driven by a superposition of fields at 1290 nm and 780 nm. These fields are not commensurate in frequency and the superposition leads to an increase in the yield of the mid-plateau harmonics of more than two orders of magnitude compared to using the 1290 nm field alone. Significant extension of the cut-off photon energy is seen even by adding only a small amount of the 780 nm field. These observations are explained by calculations performed in the strong field approximation. Most importantly we find that enhancement is found to arise as a consequence of both increased ionization in the sum-field and modification of the electron trajectories leading to an earlier return time. The enhanced yield even when using modest intensity fields of 5 x 1013 Wcm−2 is extended to the 80 eV range and is a promising route to provide a greater photon number for applications in XUV imaging and time-resolved experiments at a high repetition rate.

© 2010 OSA

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  1. M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
    [CrossRef] [PubMed]
  2. P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
    [CrossRef] [PubMed]
  3. S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
    [CrossRef] [PubMed]
  4. A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
    [CrossRef] [PubMed]
  5. M. D. Perry and J. K. Crane, “High-order harmonic emission from mixed fields,” Phys. Rev. A 48(6), R4051–R4054 (1993).
    [CrossRef]
  6. H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
    [CrossRef] [PubMed]
  7. U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
    [CrossRef]
  8. I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).
  9. T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
    [CrossRef]
  10. I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).
  11. F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
    [CrossRef] [PubMed]
  12. H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
    [CrossRef]
  13. P. B. Corkum, “Plasma perspective on strong field multiphoton ionization,” Phys. Rev. Lett. 71(13), 1994–1997 (1993).
    [CrossRef] [PubMed]
  14. K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
    [CrossRef] [PubMed]
  15. R. Torres, T. Siegel, L. Brugnera, I. Procino, J. G. Underwood, C. Altucci, R. Velotta, E. Springate, C. Froud, I. C. E. Turcu, S. Patchkovskii, M. Y. Ivanov, O. Smirnova, and J. P. Marangos are preparing a manuscript to be called “Revealing molecular structure and dynamics through high harmonic generation driven by mid-IR fields.”
  16. B. Shan and Z. Chang, “Dramatic extension of the high-order harmonic cut-off by using a long-wavelength driving field,” Phys. Rev. A 65(1), 1–4 (2001).
    [CrossRef]
  17. J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
    [CrossRef]
  18. P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
    [CrossRef]
  19. A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
    [CrossRef]
  20. J. A. Perez-Hernandez, L. Roso, and L. Plaja, “Harmonic generation beyong the strong field approximation: the physics behind the short wave infrared scalings laws,” Opt. Express 17(12), 9891–9903 (2009).
    [CrossRef]
  21. Private communication with Julien Bertrand, NRC (2009)
  22. G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
    [CrossRef]
  23. B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
    [CrossRef]
  24. M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
    [CrossRef] [PubMed]
  25. N. H. Shon, A. Suda, and K. Midorikawa, “Generation and propagation of high-order harmonics in high-pressure gases,” Phys. Rev. A 62(2), 1–6 (2000).
    [CrossRef]
  26. M. B. Gaarde, J. L. Tate, and K. J. Schafer, “Macroscopic aspects of attosecond pulse generation,” J. Phys. At. Mol. Opt. Phys. 41(13), 1–26 (2008).
    [CrossRef]
  27. L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
    [CrossRef]
  28. E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
    [CrossRef]
  29. E. J. Takahashi, P. Lan, and K. Midorikawa are preparing a manuscript to be called “Generation of continuum harmonic spectrum using multicycle two-color infrared laser fields.”
  30. L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
    [CrossRef]

2010

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

2009

F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
[CrossRef] [PubMed]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

J. A. Perez-Hernandez, L. Roso, and L. Plaja, “Harmonic generation beyong the strong field approximation: the physics behind the short wave infrared scalings laws,” Opt. Express 17(12), 9891–9903 (2009).
[CrossRef]

L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
[CrossRef]

2008

M. B. Gaarde, J. L. Tate, and K. J. Schafer, “Macroscopic aspects of attosecond pulse generation,” J. Phys. At. Mol. Opt. Phys. 41(13), 1–26 (2008).
[CrossRef]

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

2007

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

2006

L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
[CrossRef]

T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
[CrossRef]

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

2005

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

2001

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

B. Shan and Z. Chang, “Dramatic extension of the high-order harmonic cut-off by using a long-wavelength driving field,” Phys. Rev. A 65(1), 1–4 (2001).
[CrossRef]

2000

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

N. H. Shon, A. Suda, and K. Midorikawa, “Generation and propagation of high-order harmonics in high-pressure gases,” Phys. Rev. A 62(2), 1–6 (2000).
[CrossRef]

1999

U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
[CrossRef]

1995

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

1994

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

1993

M. D. Perry and J. K. Crane, “High-order harmonic emission from mixed fields,” Phys. Rev. A 48(6), R4051–R4054 (1993).
[CrossRef]

P. B. Corkum, “Plasma perspective on strong field multiphoton ionization,” Phys. Rev. Lett. 71(13), 1994–1997 (1993).
[CrossRef] [PubMed]

K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
[CrossRef] [PubMed]

Agostini, P.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Altucci, C.

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Andiel, U.

U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
[CrossRef]

Auge, F.

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Auguste, T.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

Baker, S.

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Balcou, Ph.

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

Bandulet, H.-C.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Becker, W.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Biegert, J.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Bisson, E.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

Blaga, C. I.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Bougeard, M.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Breger, P.

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Bruzzese, R.

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Calegari, F.

Carre, B.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Catoire, F.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Caumes, J. P.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Ceccherini, P.

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Cerullo, G.

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Chang, Z.

B. Shan and Z. Chang, “Dramatic extension of the high-order harmonic cut-off by using a long-wavelength driving field,” Phys. Rev. A 65(1), 1–4 (2001).
[CrossRef]

Chipperfield, L. E.

L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
[CrossRef]

L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
[CrossRef]

Chirila, C. C.

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Chirla, R.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Cho, D. J.

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Chubar, O.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Clarke, J. A.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Colosimo, P.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Comtois, D.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Corkum, P. B.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

P. B. Corkum, “Plasma perspective on strong field multiphoton ionization,” Phys. Rev. Lett. 71(13), 1994–1997 (1993).
[CrossRef] [PubMed]

Cormier, E.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
[CrossRef]

Couprie, M.-E.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Crane, J. K.

M. D. Perry and J. K. Crane, “High-order harmonic emission from mixed fields,” Phys. Rev. A 48(6), R4051–R4054 (1993).
[CrossRef]

de Lisio, C.

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

De Silvestri, S.

F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
[CrossRef] [PubMed]

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Dimauro, L. F.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
[CrossRef] [PubMed]

Doumy, G.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Drescher, M.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Dunning, D. J.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Egbert, A.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Eichmann, H.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Fleischer, A.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

Frassetto, F.

Gaarde, M. B.

M. B. Gaarde, J. L. Tate, and K. J. Schafer, “Macroscopic aspects of attosecond pulse generation,” J. Phys. At. Mol. Opt. Phys. 41(13), 1–26 (2008).
[CrossRef]

Gallmann, L.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Garzella, D.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Giguere, M.

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Gobert, O.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Guandalini, A.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Hara, T.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Hauri, C.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Haworth, C. A.

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Hentschel, M.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Hirst, G. J.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Holler, M.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Inoue, S.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Ivanov, M. Yu.

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

Jakubczak, K.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

Jong Kim, I.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Kajumba, N.

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Kanai, T.

T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
[CrossRef]

Keller, U.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Kieffer, J.-C.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Kienberger, R.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Kim, C. M.

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Kim, H. T.

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Kim, T. K.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

Kitamura, H.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Knight, P. L.

L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
[CrossRef]

Krausz, F.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Kulander, K. C.

K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
[CrossRef] [PubMed]

L’Huillier, A.

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

Labat, M.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Lambert, G.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Lee, G. H.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Lee, Y. S.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Légaré, F.

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Lein, M.

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Lewenstein, M.

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

Liu, T. T.

T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
[CrossRef]

Long, S.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Marangos, J. P.

L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
[CrossRef]

L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
[CrossRef]

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

March, A. M.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

McIver, J. K.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

McNeil, B. W. J.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Merdji, H.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Midorikawa, K.

N. H. Shon, A. Suda, and K. Midorikawa, “Generation and propagation of high-order harmonics in high-pressure gases,” Phys. Rev. A 62(2), 1–6 (2000).
[CrossRef]

Mocek, T.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

Momma, C.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Monmayrant, A.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Muller, H. G.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Mullot, G.

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Nam, C. H.

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Namb, C. H.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

Negro, M.

Nisoli, M.

F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
[CrossRef] [PubMed]

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Nolte, S.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Owen, H. L.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Park, J. Y.

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

Park, S. B.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

Paul, P. M.

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Paulus, G. G.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Pepin, H.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

Perez-Hernandez, J. A.

Perry, M. D.

M. D. Perry and J. K. Crane, “High-order harmonic emission from mixed fields,” Phys. Rev. A 48(6), R4051–R4054 (1993).
[CrossRef]

Plaja, L.

Poletto, L.

F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
[CrossRef] [PubMed]

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Priori, E.

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Reider, G. A.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Robinson, J. S.

L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
[CrossRef]

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Roso, L.

Salieres, P.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

Salières, P.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Sansone, G.

Schafer, K. J.

M. B. Gaarde, J. L. Tate, and K. J. Schafer, “Macroscopic aspects of attosecond pulse generation,” J. Phys. At. Mol. Opt. Phys. 41(13), 1–26 (2008).
[CrossRef]

K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
[CrossRef] [PubMed]

Schapper, F.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Sekikawa, T.

T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
[CrossRef]

Shan, B.

B. Shan and Z. Chang, “Dramatic extension of the high-order harmonic cut-off by using a long-wavelength driving field,” Phys. Rev. A 65(1), 1–4 (2001).
[CrossRef]

Sheehy, B.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Shiner, A. D.

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Shintake, T.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Shon, N. H.

N. H. Shon, A. Suda, and K. Midorikawa, “Generation and propagation of high-order harmonics in high-pressure gases,” Phys. Rev. A 62(2), 1–6 (2000).
[CrossRef]

Smith, R. A.

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Spielmann, C.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Stagira, S.

F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
[CrossRef] [PubMed]

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Suda, A.

N. H. Shon, A. Suda, and K. Midorikawa, “Generation and propagation of high-order harmonics in high-pressure gases,” Phys. Rev. A 62(2), 1–6 (2000).
[CrossRef]

Tahara, K.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Tanaka, Y.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Tanikawa, T.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

Tate, J.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

Tate, J. L.

M. B. Gaarde, J. L. Tate, and K. J. Schafer, “Macroscopic aspects of attosecond pulse generation,” J. Phys. At. Mol. Opt. Phys. 41(13), 1–26 (2008).
[CrossRef]

Tempea, G.

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

Teng, H.

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Thompson, N. R.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Tisch, J. W. G.

L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
[CrossRef]

L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
[CrossRef]

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Toma, E. S.

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

Trallero-Herrero, C.

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Tsakiris, G. D.

U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
[CrossRef]

Villeneuve, D. M.

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

Villoresi, P.

F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett. 34(20), 3125–3127 (2009).
[CrossRef] [PubMed]

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Vozzi, C.

Walmsley, I. A.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Watanabe, S.

T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
[CrossRef]

Wellegehausen, B.

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

Wheeler, J.

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Williams, P. H.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Witte, K.

U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
[CrossRef]

Wyatt, A. S.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Yang, B.

K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
[CrossRef] [PubMed]

Zaïr, A.

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

Appl. Phys. Lett.

I. Jong Kim, G. H. Lee, S. B. Park, Y. S. Lee, T. K. Kim, C. H. Namb, T. Mocek, and K. Jakubczak, “Generation of submicrojoule high harmonics using a long gas jet in a two-color laser field,” Appl. Phys. Lett. 92, 1–3 (2008).

Europhys. Lett.

U. Andiel, G. D. Tsakiris, E. Cormier, and K. Witte, “High-order harmonic amplitude modulation in two-colour phase controlled frequency mixing,” Europhys. Lett. 47(1), 42–48 (1999).
[CrossRef]

J. Phys. At. Mol. Opt. Phys.

M. B. Gaarde, J. L. Tate, and K. J. Schafer, “Macroscopic aspects of attosecond pulse generation,” J. Phys. At. Mol. Opt. Phys. 41(13), 1–26 (2008).
[CrossRef]

N. J. Phys.

B. W. J. McNeil, J. A. Clarke, D. J. Dunning, G. J. Hirst, H. L. Owen, N. R. Thompson, B. Sheehy, and P. H. Williams, “An XUV-FEL amplifier seeded using high harmonic generation,” N. J. Phys. 9(4), 82 (2007).
[CrossRef]

Nat. Phys.

G. Lambert, T. Hara, D. Garzella, T. Tanikawa, M. Labat, B. Carre, H. Kitamura, T. Shintake, M. Bougeard, S. Inoue, Y. Tanaka, P. Salieres, H. Merdji, O. Chubar, O. Gobert, K. Tahara, and M.-E. Couprie, “Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light,” Nat. Phys. 4(4), 296–300 (2008).
[CrossRef]

P. Colosimo, G. Doumy, C. I. Blaga, J. Wheeler, C. Hauri, F. Catoire, J. Tate, R. Chirla, A. M. March, G. G. Paulus, H. G. Muller, P. Agostini, and L. F. Dimauro, “Scaling strong-field interactions towards the classical limit,” Nat. Phys. 4(5), 386–389 (2008).
[CrossRef]

Opt. Commun.

L. E. Chipperfield, P. L. Knight, J. W. G. Tisch, and J. P. Marangos, “Tracking individual electron trajectories in a high harmonic spectrum,” Opt. Commun. 264(2), 494–501 (2006).
[CrossRef]

Opt. Express

Opt. Lett.

Phys. Rev. A

H.-C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pepin, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Gating attosecond pulse train generation using multicolor laser fields,” Phys. Rev. A 81(1), 013803 (2010).
[CrossRef]

B. Shan and Z. Chang, “Dramatic extension of the high-order harmonic cut-off by using a long-wavelength driving field,” Phys. Rev. A 65(1), 1–4 (2001).
[CrossRef]

T. T. Liu, T. Kanai, T. Sekikawa, and S. Watanabe, “Significant enhancement of high-order harmonics below 10 nm in a two-color laser field,” Phys. Rev. A 73(6), 1–8 (2006).
[CrossRef]

M. D. Perry and J. K. Crane, “High-order harmonic emission from mixed fields,” Phys. Rev. A 48(6), R4051–R4054 (1993).
[CrossRef]

H. Eichmann, A. Egbert, S. Nolte, C. Momma, B. Wellegehausen, W. Becker, S. Long, and J. K. McIver, “Polarization-dependent high-order two-color mixing,” Phys. Rev. A 51(5), R3414–R3417 (1995).
[CrossRef] [PubMed]

M. Lewenstein, Ph. Balcou, M. Yu. Ivanov, A. L’Huillier, and P. B. Corkum, “Theory of high-harmonic generation by low-frequency laser fields,” Phys. Rev. A 49(3), 2117–2132 (1994).
[CrossRef] [PubMed]

N. H. Shon, A. Suda, and K. Midorikawa, “Generation and propagation of high-order harmonics in high-pressure gases,” Phys. Rev. A 62(2), 1–6 (2000).
[CrossRef]

E. Priori, G. Cerullo, M. Nisoli, S. Stagira, S. De Silvestri, P. Villoresi, L. Poletto, P. Ceccherini, C. Altucci, R. Bruzzese, and C. de Lisio, “Nonadiabatic three-dimensional model of high-order harmonic generation in the few-optical-cycle regime,” Phys. Rev. A 61(6), 1–8 (2000).
[CrossRef]

Phys. Rev. Lett.

L. E. Chipperfield, J. S. Robinson, J. W. G. Tisch, and J. P. Marangos, “Ideal Waveform to Generate the Maximum Possible Electron Recollision Energy for Any Given Oscillation Period,” Phys. Rev. Lett. 102(6), 1–4 (2009).
[CrossRef]

A. Zaïr, M. Holler, A. Guandalini, F. Schapper, J. Biegert, L. Gallmann, U. Keller, A. S. Wyatt, A. Monmayrant, I. A. Walmsley, E. Cormier, T. Auguste, J. P. Caumes, and P. Salières, “Quantum path interferences in high-order harmonic generation,” Phys. Rev. Lett. 100(14), 143902 (2008).
[CrossRef] [PubMed]

I. Jong Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, “Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field,” Phys. Rev. Lett. 94, 1–4 (2005).

J. Tate, T. Auguste, H. G. Muller, P. Salieres, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98(1), 1–4 (2007).
[CrossRef]

A. D. Shiner, C. Trallero-Herrero, N. Kajumba, H.-C. Bandulet, D. Comtois, F. Légaré, M. Giguere, J.-C. Kieffer, P. B. Corkum, and D. M. Villeneuve, “Wavelength Scaling of High Harmonic Generation Efficiency,” Phys. Rev. Lett. 103(7), 1–4 (2009).
[CrossRef]

P. B. Corkum, “Plasma perspective on strong field multiphoton ionization,” Phys. Rev. Lett. 71(13), 1994–1997 (1993).
[CrossRef] [PubMed]

K. J. Schafer, B. Yang, L. F. DiMauro, and K. C. Kulander, “Above threshold ionization beyond the high harmonic cut-off,” Phys. Rev. Lett. 70(11), 1599–1602 (1993).
[CrossRef] [PubMed]

Science

M. Drescher, M. Hentschel, R. Kienberger, G. Tempea, C. Spielmann, G. A. Reider, P. B. Corkum, and F. Krausz, “X-ray Pulses Approaching the Attosecond Frontier,” Science 291(5510), 1923–1927 (2001).
[CrossRef] [PubMed]

P. M. Paul, E. S. Toma, P. Breger, G. Mullot, F. Auge, Ph. Balcou, H. G. Muller, and P. Agostini, “Observation of a train of attosecond pulses from high harmonic generation,” Science 292(5522), 1689–1692 (2001).
[CrossRef] [PubMed]

S. Baker, J. S. Robinson, C. A. Haworth, H. Teng, R. A. Smith, C. C. Chirilă, M. Lein, J. W. G. Tisch, and J. P. Marangos, “Probing proton dynamics in molecules on an attosecond time scale,” Science 312(5772), 424–427 (2006).
[CrossRef] [PubMed]

Other

R. Torres, T. Siegel, L. Brugnera, I. Procino, J. G. Underwood, C. Altucci, R. Velotta, E. Springate, C. Froud, I. C. E. Turcu, S. Patchkovskii, M. Y. Ivanov, O. Smirnova, and J. P. Marangos are preparing a manuscript to be called “Revealing molecular structure and dynamics through high harmonic generation driven by mid-IR fields.”

E. J. Takahashi, P. Lan, and K. Midorikawa are preparing a manuscript to be called “Generation of continuum harmonic spectrum using multicycle two-color infrared laser fields.”

Private communication with Julien Bertrand, NRC (2009)

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Figures (5)

Fig. 1
Fig. 1

Harmonic intensity as a function of delay between the two pulses for a) I1290 = I780 = 0.5 × 1014 Wcm−2.We observe an enhancement of more than 2 orders of magnitude and a cut-off extension from 40 eV to beyond 80 eV b) I1290 = 1.5×1014 Wcm−2 and I780 = 0.2×1014 Wcm−2. We observed an enhancement of a factor 4 but the cut-off of the single color field is already beyond the detection range. Both images have been normalized to their respective maxima and plotted on the same color scale

Fig. 2
Fig. 2

Plot of the intensity of the 25th harmonic of 1290 nm field as a function of time delay between the 780 nm pulse and the 1290 nm pulse. Left column: experimental data; right column: single atom calculation. The black lines in the right column correspond to the exact intensities extracted from the cut-off measurement and the intensities for the cases drawn in red were adjusted for best match of the experimental data but were still within 50% of the retrieved values. All the other harmonics follow a similar trend but only one was plotted for clarity.

Fig. 3
Fig. 3

Electric field amplitude (grey dashed curve) of the sum of the 1290 nm field and 780 nm field (delay and CEP fixed at zero) and the classically calculated electron trajectories driven by this field (colored lines). The red dots mark the nine ionized electron bunches which have been selected for the plot in Fig. 5 as they are the ones which will dominate the mid plateau region photon emission.

Fig. 4
Fig. 4

a) Calculated harmonic spectra after propagation for the two color case with the intensities of the 1290 nm and 780 nm fields matched at 0.5×1014 Wcm−2 (blue curve) compared to the 1290 nm field alone with a four fold increase in intensity (red curve). b) Derived APTs from an inverse Fourier transform of the spectra in (a) normalized to the peak value of the 1290 nm APT. c) Fraction of the electronic population remaining in the ground state as a function of time for three different pulses; the two aforementioned ones and the 780 nm at 2×1014 Wcm−2 (green curve), as calculated using the time dependent Schrödinger equation. The total ionization due to the SMURF pulse is much less than that due to the reference single color pulse.

Fig. 5
Fig. 5

Comparison of the ADK ionization rates and electron excursion times for the same two cases as Fig. 4. The left most nine lines are obtained by SMURF and the right most nine ones with the single color. Only the nine most significant electron bursts from each case have been plotted for clarity which correspond to the red dots in Fig. 3. The grey dotted lines indicate lines of equal photon energies.

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