Abstract

We report on the direct generation of broadband mid-IR pulses from an optical parametric amplifier. Several crystals with extended IR transparency, when pumped at 800 nm, display a broad phase-matching bandwidth around 1 μm, allowing for the generation of idler pulses spanning the 3–5 μm wavelength range. Using LiIO3, we produce 2-μJ pulses tunable in the 3–4 μm range with bandwidth supporting 30-fs transform-limited duration.

©2007 Optical Society of America

1. Introduction

The generation of few-optical-cycle light pulses in the mid-IR (3–6 μm) wavelength range is crucial for many applications ranging from time-resolved spectroscopy to high-field science. Such wavelength range overlaps several important vibrational transitions in molecules [1–3], as well as electronic transitions in highly correlated materials [4] (superconductors, colossal magnetoresistance materials) and intersubband transitions in quantum confined semiconductors [5]. In addition mid-IR pulses are expected to increase the cut-off energy for high harmonic generation [6].

Traditionally, mid-IR pulses are produced in two ways: (i) difference-frequency generation (DFG) between signal and idler of a near-IR optical parametric amplifier (OPA) [7–9], of an optical parametric oscillator [10, 11] or, more generally, between two pulses produced by different sources [12–16]; (ii) DFG between different frequency components of a single broadband pulse [17–20]. Mid-IR pulses have also been directly generated as idler pulses of an OPA, by tuning the signal as close as possible to the pump wavelength [21–25]. These OPA systems employed crystals with transparency range extended to 5–6 μm, such as KTiOPO4, LiIO3, LiNbO3 and KNbO3. Up to now, however, due to the quasi-monochromatic seeding, mid-IR OPAs have generated only relatively narrowband pulses, with transform-limited (TL) pulsewidths longer than 50 fs.

In this paper we show that several crystals with extended IR transparency, when pumped at 800 nm, display a broad phase matching bandwidth around 1 μm, allowing the direct generation of broadband idler pulses spanning the 3–5 μm wavelength range with duration down to two optical cycles. We experimentally demonstrate this configuration with LiIO3, producing up to 2-μJ energy pulses with spectra supporting 30-fs TL duration, corresponding to approximately three optical cycles. Further advantages of our approach are energy scalability and the generation of pulses with a stable carrier-envelope phase (CEP) [26, 27].

2. Broadband mid-IR OPA

The basic idea underlying our configuration is to achieve broadband amplification of signal pulses at a carrier wavelength as close as possible to the pump wavelength, thus pushing the carrier wavelength of the resulting broadband idler as far as possible to the infrared.

In an OPA, the phase matching bandwidth is given to the first order by Δω ∝ ∣δsi∣ where δsi = 1/Vgs - 1/Vgi is the group velocity mismatch (GVM) between signal and idler. Broadband parametric gain is therefore achieved when the group velocities of signal and idler are matched [28]. Figure 1(a) plots δsi as a function of signal wavelength for several nonlinear optical crystals with broad mid-IR transparency range, using type I phase matching.

 figure: Fig. 1.

Fig. 1. (a). Calculated signal-idler group-velocity mismatch at 800 nm pump wavelength for several nonlinear optical crystals with extended mid-IR transparency. (b) Group velocity mismatch between signal and pump for the same crystals. PPLN, periodically poled lithium niobate; PPSLT, periodically poled stoichiometric lithium tantalate.

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As expected, group velocity matching is achieved at the degeneracy point, where signal and idler share the same wavelength and polarization; interestingly, however, there is another group velocity matching wavelength, which occurs, depending on the crystal, between 950 and 1050 nm [29]. Qualitatively, this can be understood by recalling that these are high refractive index materials, with a zero dispersion wavelength (corresponding to a maximum of the group velocity) around 1.9–2 μm; one can therefore expect similar group velocities for the ∼1 μm signal and the ∼3.5 μm idler. In these crystals it is therefore possible to amplify a broad signal bandwidth around 1 μm and produce a correspondingly broad idler in the mid-IR. A first qualitative comparison among the crystals can be obtained by plotting (Figs. 2(a) and 2(b)) the frequency-dependent parametric gain assuming monochromatic and undepleted pump. Another important parameter in an OPA is the GVM between the signal/idler and pump, which defines the interaction length and thus the parametric gain. Figure 1(b) plots δsp as a function of signal wavelength for the same crystals shown in Fig. 1(a). For the crystals exploiting birefringent phase matching, GVM values are quite low for signal wavelengths around 1 μm, corresponding to the broadband phase matching condition, while the periodically poled crystals have higher GVM. This analysis indicates that LiIO3 combines a broad phase-matching bandwidth, extended mid-IR tunability (see Fig. 2(b)) and low pump-signal GVM; this crystal has therefore been chosen for the experiments.

 figure: Fig. 2.

Fig. 2. (a,b). Calculated frequency dependence of the parametric gain for 2-mm-thick 800-nm pumped LiIO3, KNbO3 and PPSLT crystals, assuming phase-matching at zero GVM point; (c,d) complete simulation of signal and idler bandwidths for LiIO3 according to the model described in the text.

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The previous qualitative predictions about the broadband mid-IR amplification have been confirmed by performing numerical simulations of a collinear OPA, pumped at 800 nm and employing a 2-mm-thick type I LiIO3. We solved the coupled three-beam time-dependent nonlinear propagation equations in the plane wave approximation, considering only second order nonlinear interactions and including material dispersion to all orders. We used a broadband seed pulse (7-fs centred at 1 μm) to simulate the white light continuum (WLC) generated in sapphire by 800-nm 50-fs long pump pulses. Figures 2(c) and 2(d) show the calculated amplified signal and idler spectra, respectively; the idler spans the 3–5 μm wavelength range and supports a 22-fs TL pulsewidth, i.e. approximately two optical cycles.

3. Experimental results

The experimental setup of the mid-IR OPA is shown in Fig. 3. It is pumped by 300 μJ, 50 fs, 800 nm, 1 kHz pulses from a regeneratively amplified Ti:sapphire laser (Coherent Legend). A 3-μJ fraction of the energy is focused in a 2-mm-thick sapphire plate to generate a single-filament WLC, used as a seed. The spectral portion of the WLC around 1 μm is first amplified in a non-collinear OPA (seed generation stage) and then fed into the mid-IR OPA, which generates the 3–5 μm idler in a collinear geometry to avoid angular dispersion. For the seed generation we used two different configurations: (i) 800-nm pumped 2-mm-thick type I LiIO3 crystal (θ = 21.5°); (ii) 400-nm pumped 1-mm-thick type I BBO crystal (θ = 29°) [30]. The first configuration provided broader bandwidth (28 THz) but lower energy (200 nJ), while the second configuration had an higher output energy (1 μJ) with a slightly narrower bandwidth (21 THz). Since LiIO3 has a relatively low nonlinear coefficient we preferred to use the 400-nm pumped configuration that provides higher seed energy. For different crystals with higher nonlinearity, such as PPSLT, the 800-nm pumped seed generation stage could yield better results since it gives the best matching with the gain bandwidth of the IR OPA.

 figure: Fig. 3.

Fig. 3. Experimental setup; BS, beam splitter; DL, delay line; SHG, second-harmonic generation; WLG, white light generation; DM, dichroic mirror; Au, gold mirror. In the first stage it is possible to switch from 800-nm pumped LiIO3 to 400-nm pumped BBO, substituting the λ/2 plate with a SHG crystal (BBO, 1 mm, type I, θ = 29°).

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The output of the seed generation stage was collimated and collinearly combined with the residual pump by a dichroic mirror. The mid-IR OPA used a 2-mm-thick type I LiIO3 crystal (θ = 21.5°) and, pumped by 200-μJ 800-nm pulses, produced more than 8-μJ signal energy around 1–1.1 μm. After the OPA the idler beam was collimated by an uncoated germanium lens, that also provided filtering of the pump and signal beams. The idler power measured by a thermal power-meter, after taking into account the Fresnel losses introduced by the lens, was 2 mW (2 μJ pulse energy), in good agreement with expectations from the Manley-Rowe relations. The mid-IR spectra were measured with a grating monochromator and a lithium tantalate pyroelectric detector together with a lock-in amplifier.

Figure 4 shows a sequence of idler spectra obtained by changing the pump-signal delay and slightly varying the phase-matching angle. We obtained pulses tunable from 3 to 4 μm with an unprecedented combination of high energy (μJ-level) and broad bandwidth (≈30 fs TL duration). We note that the dip observed around 4.2 μm is due to atmospheric CO2 absorption, so that even broader bandwidth could be achieved by purging the system. We could tune the system further to the IR up to 5 μm but with reduced bandwidth. Our numerical simulations predict even broader idler bandwidth and we believe that we are currently limited by the chirp introduced on the 1-μm seed by the refractive optics, which prevents temporal overlap of all the spectral components with the short pump pulse. Reducing this chirp by the use of reflective optics and/or stretching the pump pulses, we should be able to improve the pump-seed temporal overlap and amplify broader bandwidths, so as to approach the predicted ≈ 20 fs limit.

 figure: Fig. 4.

Fig. 4. Idler spectra from the second stage.

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The broadband mid-IR pulses are expected to have negative dispersion as a result of the nonlinear parametric amplification process, which induces in the idler a chirp opposite to that of the signal (positive), and of the propagation in the LiIO3 crystal, which displays negative dispersion in the mid-IR. These pulses should be compressible to the TL by propagation in a properly chosen thickness of materials such as silicon, germanium or zinc selenide, having positive dispersion in the mid-IR spectral region [31]. At the highest pump intensity levels, we observed optical damage of the LiIO3 crystal in the second OPA stage; we expect that more robust operation and further energy scaling should be achievable by crystals with slightly less favourable phase matching characteristics but larger nonlinear optical coefficient and higher damage threshold, such as KNbO3 and PPSLT (see Fig. 1).

In conclusion, we have proposed and experimentally demonstrated the possibility of generating broadband high-energy mid-IR pulses from an OPA. We have shown that several crystals with extended IR transparency, when pumped at 800 nm, display a broad phase-matching bandwidth around 1 μm, allowing the generation of idler pulses spanning the 3–5 μm wavelength range. In a LiIO3 crystal we have obtained 2-μJ pulses with bandwidths supporting three-optical-cycle durations. Moreover these pulses, being generated by a DFG process between two pulses derived from the same source [26, 27], are expected to have a stable CEP, which is an important feature in high field processes which are governed by the electric field rather than the intensity of the pulse.

Acknowledgments

This work was partially supported by the European Union within the contract RII3-CT-2003-506350 (Laserlab Europe).

References and Links

1. S. Woutersen, U. Emmerichs, and H. J. Bakker, “Femtosecond mid-IR pump-probe spectroscopy of liquid water: Evidence for a two-component structure,” Science 278, 658–660 (1997). [CrossRef]  

2. A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003). [CrossRef]   [PubMed]  

3. M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005). [CrossRef]   [PubMed]  

4. R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000). [CrossRef]   [PubMed]  

5. C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004). [CrossRef]   [PubMed]  

6. J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007). [CrossRef]   [PubMed]  

7. G. M. Gale, G. Gallot, F. Hache, and R. Sander, “Generation of intense highly coherent femtosecond pulses in the mid infrared,” Opt. Lett. 22, 1253–1255 (1997). [CrossRef]   [PubMed]  

8. F. Seifert, V. Petrov, and M. Woerner, “Solid-state laser system for the generation of midinfrared femtosecond pulses tunable from 3.3 to 10 μm,” Opt. Lett. 19, 2009–2011 (1994). [CrossRef]   [PubMed]  

9. R. A. Kaindl, M. Wurm, K. Reimann, P. Hamm, A. M. Weiner, and M. Woerner, “Generation, shaping, and characterization of intense femtosecond pulses tunable from 3 to 20 μm,” J. Opt. Soc. Am. B 17, 2086–2094 (2000). [CrossRef]  

10. J. M. Fraser, D. Wang, A. Haché, G. R. Allan, and H. M. van Driel, “Generation of high-repetition-rate femtosecond pulses from 8 to 18 μm,” Appl. Opt. 36, 5044–5047 (1997). [CrossRef]   [PubMed]  

11. S. Ehret and H. Schneider, “Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz,” Appl. Phys. B 66, 27–30 (1998). [CrossRef]  

12. D. S. Moore and S. C. Schmidt, “Tunable subpicosecond infrared pulse generation to 4 μm,” Opt. Lett. 12, 480–482 (1987). [CrossRef]   [PubMed]  

13. T. Elsaesser and M. C. Nuss, “Femtosecond pulses in the mid-infrared generated by downconversion of a traveling-wave dye laser,” Opt. Lett. 16, 411–413 (1991). [CrossRef]   [PubMed]  

14. P. Hamm, C. Lauterwasser, and W. Zinth, “Generation of tunable subpicosecond light pulses in the midinfrared between 4.5 and 11.5 μm,” Opt. Lett. 18, 1943–1945 (1993). [CrossRef]   [PubMed]  

15. M. R. X. de Barros, R. S. Miranda, T. M. Jedju, and P. C. Becker, “High-repetition-rate femtosecond midinfrared pulse generation,” Opt. Lett. 20, 480–482 (1995). [CrossRef]   [PubMed]  

16. C. Erny, K. Moutzouris, J. Biegert, D. Kühlke, F. Adler, A. Leitenstorfer, and U. Keller, “Mid-infrared difference-frequency generation of ultrashort pulses tunable between 3.2 and 4.8 μm from a compact fiber source,” Opt. Lett. 32, 1138–1140 (2007). [CrossRef]   [PubMed]  

17. A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995). [CrossRef]  

18. R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998). [CrossRef]  

19. R. A. Kaindl, F. Eickemeyer, M. Woerner, and T. Elsaesser, “Broadband phase-matched difference frequency mixing of femtosecond pulses in GaSe: Experiment and theory,” Appl. Phys. Lett. 75, 1060–1062 (1999). [CrossRef]  

20. T. Zentgraf, R. Huber, N. C. Nielsen, D. S. Chemla, and R. A. Kaindl, “Ultrabroadband 50–130 THz pulses generated via phase-matched difference frequency mixing in LiIO3,” Opt. Express 15, 5775–5781 (2007). [CrossRef]   [PubMed]  

21. V. Petrov and F. Noack, “Mid-infrared femtosecond optical parametric amplification in potassium niobate,” Opt. Lett. 21, 1576–1578 (1996). [CrossRef]   [PubMed]  

22. V. Petrov, F. Noack, and R. Stolzenberger, “Seeded femtosecond optical parametric amplification in the mid-infrared spectral region above 3 μm,” Appl. Opt. 36, 1164–1172 (1997). [CrossRef]   [PubMed]  

23. U. Emmerichs, S. Woutersen, and H. J. Bakker, “Generation of intense femtosecond optical pulses near 3 μm with a kilohertz repetition rate,” J. Opt. Soc. Am. B 14, 1480–1483 (1997). [CrossRef]  

24. F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, and F. Laurell, “Efficient femtosecond traveling-wave optical parametric amplification in periodically poled KTiOPO4,” Opt. Lett. 24, 1874–1876 (1999). [CrossRef]  

25. F. Rotermund, V. Petrov, F. Noack, M. Wittmann, and G. Korn, “Laser-diode-seeded operation of a femtosecond optical parametric amplifier with MgO:LiNbO3 and generation of 5-cycle pulses near 3 μm,” J. Opt. Soc. Am. B 16, 1539–1545 (1999). [CrossRef]  

26. A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002). [CrossRef]  

27. C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007). [CrossRef]  

28. G. Cerullo and S. De Silvestri, “Ultrafast optical parametric amplifiers,” Rev. Sci. Instrum. 74, 1–18 (2003). [CrossRef]  

29. G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007). [CrossRef]   [PubMed]  

30. J. Piel, M. Beutter, and E. Riedle, “20–50-fs pulses tunable across the near infrared from a blue-pumped noncollinear parametric amplifier,” Opt. Lett. 25, 180–182 (2000). [CrossRef]  

31. N. Demirdöven, M. Khalil, O. Golonzka, and A. Tokmakoff, “Dispersion compensation with optical materials for compression of intense sub-100-fs mid-infrared pulses,” Opt. Lett. 27, 433–435 (2002). [CrossRef]  

References

  • View by:

  1. S. Woutersen, U. Emmerichs, and H. J. Bakker, “Femtosecond mid-IR pump-probe spectroscopy of liquid water: Evidence for a two-component structure,” Science 278, 658–660 (1997).
    [Crossref]
  2. A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003).
    [Crossref] [PubMed]
  3. M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
    [Crossref] [PubMed]
  4. R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
    [Crossref] [PubMed]
  5. C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
    [Crossref] [PubMed]
  6. J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
    [Crossref] [PubMed]
  7. G. M. Gale, G. Gallot, F. Hache, and R. Sander, “Generation of intense highly coherent femtosecond pulses in the mid infrared,” Opt. Lett. 22, 1253–1255 (1997).
    [Crossref] [PubMed]
  8. F. Seifert, V. Petrov, and M. Woerner, “Solid-state laser system for the generation of midinfrared femtosecond pulses tunable from 3.3 to 10 μm,” Opt. Lett. 19, 2009–2011 (1994).
    [Crossref] [PubMed]
  9. R. A. Kaindl, M. Wurm, K. Reimann, P. Hamm, A. M. Weiner, and M. Woerner, “Generation, shaping, and characterization of intense femtosecond pulses tunable from 3 to 20 μm,” J. Opt. Soc. Am. B 17, 2086–2094 (2000).
    [Crossref]
  10. J. M. Fraser, D. Wang, A. Haché, G. R. Allan, and H. M. van Driel, “Generation of high-repetition-rate femtosecond pulses from 8 to 18 μm,” Appl. Opt. 36, 5044–5047 (1997).
    [Crossref] [PubMed]
  11. S. Ehret and H. Schneider, “Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz,” Appl. Phys. B 66, 27–30 (1998).
    [Crossref]
  12. D. S. Moore and S. C. Schmidt, “Tunable subpicosecond infrared pulse generation to 4 μm,” Opt. Lett. 12, 480–482 (1987).
    [Crossref] [PubMed]
  13. T. Elsaesser and M. C. Nuss, “Femtosecond pulses in the mid-infrared generated by downconversion of a traveling-wave dye laser,” Opt. Lett. 16, 411–413 (1991).
    [Crossref] [PubMed]
  14. P. Hamm, C. Lauterwasser, and W. Zinth, “Generation of tunable subpicosecond light pulses in the midinfrared between 4.5 and 11.5 μm,” Opt. Lett. 18, 1943–1945 (1993).
    [Crossref] [PubMed]
  15. M. R. X. de Barros, R. S. Miranda, T. M. Jedju, and P. C. Becker, “High-repetition-rate femtosecond midinfrared pulse generation,” Opt. Lett. 20, 480–482 (1995).
    [Crossref] [PubMed]
  16. C. Erny, K. Moutzouris, J. Biegert, D. Kühlke, F. Adler, A. Leitenstorfer, and U. Keller, “Mid-infrared difference-frequency generation of ultrashort pulses tunable between 3.2 and 4.8 μm from a compact fiber source,” Opt. Lett. 32, 1138–1140 (2007).
    [Crossref] [PubMed]
  17. A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
    [Crossref]
  18. R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998).
    [Crossref]
  19. R. A. Kaindl, F. Eickemeyer, M. Woerner, and T. Elsaesser, “Broadband phase-matched difference frequency mixing of femtosecond pulses in GaSe: Experiment and theory,” Appl. Phys. Lett. 75, 1060–1062 (1999).
    [Crossref]
  20. T. Zentgraf, R. Huber, N. C. Nielsen, D. S. Chemla, and R. A. Kaindl, “Ultrabroadband 50–130 THz pulses generated via phase-matched difference frequency mixing in LiIO3,” Opt. Express 15, 5775–5781 (2007).
    [Crossref] [PubMed]
  21. V. Petrov and F. Noack, “Mid-infrared femtosecond optical parametric amplification in potassium niobate,” Opt. Lett. 21, 1576–1578 (1996).
    [Crossref] [PubMed]
  22. V. Petrov, F. Noack, and R. Stolzenberger, “Seeded femtosecond optical parametric amplification in the mid-infrared spectral region above 3 μm,” Appl. Opt. 36, 1164–1172 (1997).
    [Crossref] [PubMed]
  23. U. Emmerichs, S. Woutersen, and H. J. Bakker, “Generation of intense femtosecond optical pulses near 3 μm with a kilohertz repetition rate,” J. Opt. Soc. Am. B 14, 1480–1483 (1997).
    [Crossref]
  24. F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, and F. Laurell, “Efficient femtosecond traveling-wave optical parametric amplification in periodically poled KTiOPO4,” Opt. Lett. 24, 1874–1876 (1999).
    [Crossref]
  25. F. Rotermund, V. Petrov, F. Noack, M. Wittmann, and G. Korn, “Laser-diode-seeded operation of a femtosecond optical parametric amplifier with MgO:LiNbO3 and generation of 5-cycle pulses near 3 μm,” J. Opt. Soc. Am. B 16, 1539–1545 (1999).
    [Crossref]
  26. A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002).
    [Crossref]
  27. C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
    [Crossref]
  28. G. Cerullo and S. De Silvestri, “Ultrafast optical parametric amplifiers,” Rev. Sci. Instrum. 74, 1–18 (2003).
    [Crossref]
  29. G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
    [Crossref] [PubMed]
  30. J. Piel, M. Beutter, and E. Riedle, “20–50-fs pulses tunable across the near infrared from a blue-pumped noncollinear parametric amplifier,” Opt. Lett. 25, 180–182 (2000).
    [Crossref]
  31. N. Demirdöven, M. Khalil, O. Golonzka, and A. Tokmakoff, “Dispersion compensation with optical materials for compression of intense sub-100-fs mid-infrared pulses,” Opt. Lett. 27, 433–435 (2002).
    [Crossref]

2007 (5)

2005 (1)

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

2004 (1)

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

2003 (2)

A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003).
[Crossref] [PubMed]

G. Cerullo and S. De Silvestri, “Ultrafast optical parametric amplifiers,” Rev. Sci. Instrum. 74, 1–18 (2003).
[Crossref]

2002 (2)

A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002).
[Crossref]

N. Demirdöven, M. Khalil, O. Golonzka, and A. Tokmakoff, “Dispersion compensation with optical materials for compression of intense sub-100-fs mid-infrared pulses,” Opt. Lett. 27, 433–435 (2002).
[Crossref]

2000 (3)

1999 (3)

1998 (2)

R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998).
[Crossref]

S. Ehret and H. Schneider, “Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz,” Appl. Phys. B 66, 27–30 (1998).
[Crossref]

1997 (5)

1996 (1)

1995 (2)

A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
[Crossref]

M. R. X. de Barros, R. S. Miranda, T. M. Jedju, and P. C. Becker, “High-repetition-rate femtosecond midinfrared pulse generation,” Opt. Lett. 20, 480–482 (1995).
[Crossref] [PubMed]

1994 (1)

1993 (1)

1991 (1)

1987 (1)

Adler, F.

Agostini, P.

J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
[Crossref] [PubMed]

Allan, G. R.

Auguste, T.

J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
[Crossref] [PubMed]

Bakker, H. J.

A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003).
[Crossref] [PubMed]

S. Woutersen, U. Emmerichs, and H. J. Bakker, “Femtosecond mid-IR pump-probe spectroscopy of liquid water: Evidence for a two-component structure,” Science 278, 658–660 (1997).
[Crossref]

U. Emmerichs, S. Woutersen, and H. J. Bakker, “Generation of intense femtosecond optical pulses near 3 μm with a kilohertz repetition rate,” J. Opt. Soc. Am. B 14, 1480–1483 (1997).
[Crossref]

Baltus?ka, A.

A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002).
[Crossref]

Becker, P. C.

Beutter, M.

Biegert, J.

Bonvalet, A.

A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
[Crossref]

Brida, D.

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
[Crossref] [PubMed]

Bruner, B. D.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Cerullo, G.

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
[Crossref] [PubMed]

G. Cerullo and S. De Silvestri, “Ultrafast optical parametric amplifiers,” Rev. Sci. Instrum. 74, 1–18 (2003).
[Crossref]

Chemla, D. S.

Chugh, B.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Cirmi, G.

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
[Crossref] [PubMed]

Cowan, M. L.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

de Barros, M. R. X.

De Silvestri, S.

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
[Crossref] [PubMed]

G. Cerullo and S. De Silvestri, “Ultrafast optical parametric amplifiers,” Rev. Sci. Instrum. 74, 1–18 (2003).
[Crossref]

Demirdöven, N.

DiMauro, L. F.

J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
[Crossref] [PubMed]

Dwyer, J. R.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Ehret, S.

S. Ehret and H. Schneider, “Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz,” Appl. Phys. B 66, 27–30 (1998).
[Crossref]

Eickemeyer, F.

R. A. Kaindl, F. Eickemeyer, M. Woerner, and T. Elsaesser, “Broadband phase-matched difference frequency mixing of femtosecond pulses in GaSe: Experiment and theory,” Appl. Phys. Lett. 75, 1060–1062 (1999).
[Crossref]

Elsaesser, T.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

R. A. Kaindl, F. Eickemeyer, M. Woerner, and T. Elsaesser, “Broadband phase-matched difference frequency mixing of femtosecond pulses in GaSe: Experiment and theory,” Appl. Phys. Lett. 75, 1060–1062 (1999).
[Crossref]

R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998).
[Crossref]

T. Elsaesser and M. C. Nuss, “Femtosecond pulses in the mid-infrared generated by downconversion of a traveling-wave dye laser,” Opt. Lett. 16, 411–413 (1991).
[Crossref] [PubMed]

Emmerichs, U.

S. Woutersen, U. Emmerichs, and H. J. Bakker, “Femtosecond mid-IR pump-probe spectroscopy of liquid water: Evidence for a two-component structure,” Science 278, 658–660 (1997).
[Crossref]

U. Emmerichs, S. Woutersen, and H. J. Bakker, “Generation of intense femtosecond optical pulses near 3 μm with a kilohertz repetition rate,” J. Opt. Soc. Am. B 14, 1480–1483 (1997).
[Crossref]

Erny, C.

Farnan, G. A.

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

Fraser, J. M.

Fuji, T.

A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002).
[Crossref]

Gale, G. M.

Gallot, G.

Golonzka, O.

Hache, F.

Haché, A.

Hamm, P.

Hasselbeck, M. P.

Hellström, J.

Hey, R.

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

Huber, R.

Huse, N.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Jedju, T. M.

Joffre, M.

A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
[Crossref]

Joschko, M.

Kaindl, R. A.

Keller, U.

Khalil, M.

Kobayashi, T.

A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002).
[Crossref]

Korn, G.

Kropman, M. F.

A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003).
[Crossref] [PubMed]

Kühlke, D.

Laurell, F.

Lauterwasser, C.

Leitenstorfer, A.

Luo, C. W.

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

Manzoni, C.

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
[Crossref] [PubMed]

Marangoni, M.

Martin, J.-L.

A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
[Crossref]

McCurry, M. P.

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

Migus, A.

A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
[Crossref]

Miller, R. J. D.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Miranda, R. S.

Moore, D. S.

Moutzouris, K.

Muller, H. G.

J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
[Crossref] [PubMed]

Nibbering, E. T. J.

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Nielsen, N. C.

Noack, F.

Nuss, M. C.

Omta, A. W.

A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003).
[Crossref] [PubMed]

Pasiskevicius, V.

Petrov, V.

Piel, J.

Ploog, K. H.

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

Polli, D.

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

Reimann, K.

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

R. A. Kaindl, M. Wurm, K. Reimann, P. Hamm, A. M. Weiner, and M. Woerner, “Generation, shaping, and characterization of intense femtosecond pulses tunable from 3 to 20 μm,” J. Opt. Soc. Am. B 17, 2086–2094 (2000).
[Crossref]

Riedle, E.

Rotermund, F.

Ryan, J. F.

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

Salières, P.

J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
[Crossref] [PubMed]

Sander, R.

Schmidt, S. C.

Schneider, H.

S. Ehret and H. Schneider, “Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz,” Appl. Phys. B 66, 27–30 (1998).
[Crossref]

Seifert, F.

Smith, D. C.

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998).
[Crossref]

Stolzenberger, R.

Tate, J.

J. Tate, T. Auguste, H. G. Muller, P. Salières, P. Agostini, and L. F. DiMauro, “Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field,” Phys. Rev. Lett. 98, 013901 (2007).
[Crossref] [PubMed]

Tokmakoff, A.

van Driel, H. M.

Walmsley, D. G.

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

Wang, D.

Weiner, A. M.

Wittmann, M.

Woerner, M.

C. W. Luo, K. Reimann, M. Woerner, T. Elsaesser, R. Hey, and K. H. Ploog, “Phase-Resolved Nonlinear Response of a Two-Dimensional Electron Gas under Femtosecond Intersubband Excitation,” Phys. Rev. Lett. 92, 047402 (2004).
[Crossref] [PubMed]

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, and D. G. Walmsley, “Ultrafast mid-infrared response of YBa2Cu3O7- δ,” Science 287, 470–473 (2000).
[Crossref] [PubMed]

R. A. Kaindl, M. Wurm, K. Reimann, P. Hamm, A. M. Weiner, and M. Woerner, “Generation, shaping, and characterization of intense femtosecond pulses tunable from 3 to 20 μm,” J. Opt. Soc. Am. B 17, 2086–2094 (2000).
[Crossref]

R. A. Kaindl, F. Eickemeyer, M. Woerner, and T. Elsaesser, “Broadband phase-matched difference frequency mixing of femtosecond pulses in GaSe: Experiment and theory,” Appl. Phys. Lett. 75, 1060–1062 (1999).
[Crossref]

R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998).
[Crossref]

F. Seifert, V. Petrov, and M. Woerner, “Solid-state laser system for the generation of midinfrared femtosecond pulses tunable from 3.3 to 10 μm,” Opt. Lett. 19, 2009–2011 (1994).
[Crossref] [PubMed]

Woutersen, S.

A. W. Omta, M. F. Kropman, S. Woutersen, and H. J. Bakker, “Negligible Effect of Ions on the Hydrogen-Bond Structure in Liquid Water,” Science 301, 347–349 (2003).
[Crossref] [PubMed]

S. Woutersen, U. Emmerichs, and H. J. Bakker, “Femtosecond mid-IR pump-probe spectroscopy of liquid water: Evidence for a two-component structure,” Science 278, 658–660 (1997).
[Crossref]

U. Emmerichs, S. Woutersen, and H. J. Bakker, “Generation of intense femtosecond optical pulses near 3 μm with a kilohertz repetition rate,” J. Opt. Soc. Am. B 14, 1480–1483 (1997).
[Crossref]

Wurm, M.

Zentgraf, T.

Zinth, W.

Appl. Opt. (2)

Appl. Phys. B (1)

S. Ehret and H. Schneider, “Generation of subpicosecond infrared pulses tunable between 5.2 μm and 18 μm at a repetition rate of 76 MHz,” Appl. Phys. B 66, 27–30 (1998).
[Crossref]

Appl. Phys. Lett. (3)

A. Bonvalet, M. Joffre, J.-L. Martin, and A. Migus, “Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs pulses at 100 MHz repetition rate,” Appl. Phys. Lett. 67, 2907–2909 (1995).
[Crossref]

R. A. Kaindl, F. Eickemeyer, M. Woerner, and T. Elsaesser, “Broadband phase-matched difference frequency mixing of femtosecond pulses in GaSe: Experiment and theory,” Appl. Phys. Lett. 75, 1060–1062 (1999).
[Crossref]

C. Manzoni, D. Polli, G. Cirmi, D. Brida, S. De Silvestri, and G. Cerullo, “Tunable few-optical-cycle pulses with passive carrier-envelope phase stabilization from an optical parametric amplifier,” Appl. Phys. Lett. 90, 171111 (2007).
[Crossref]

J. Opt. Soc. Am. B (3)

Nature (1)

M. L. Cowan, B. D. Bruner, N. Huse, J. R. Dwyer, B. Chugh, E. T. J. Nibbering, T. Elsaesser, and R. J. D. Miller, “Ultrafast memory loss and energy redistribution in the hydrogen bond network of liquid H2O,” Nature 434, 199–202 (2005).
[Crossref] [PubMed]

Opt. Express (1)

Opt. Lett. (13)

V. Petrov and F. Noack, “Mid-infrared femtosecond optical parametric amplification in potassium niobate,” Opt. Lett. 21, 1576–1578 (1996).
[Crossref] [PubMed]

R. A. Kaindl, D. C. Smith, M. Joschko, M. P. Hasselbeck, M. Woerner, and T. Elsaesser, “Femtosecond infrared pulses tunable from 9 to 18 μm at an 88-MHz repetition rate,” Opt. Lett. 23, 861–863 (1998).
[Crossref]

D. S. Moore and S. C. Schmidt, “Tunable subpicosecond infrared pulse generation to 4 μm,” Opt. Lett. 12, 480–482 (1987).
[Crossref] [PubMed]

T. Elsaesser and M. C. Nuss, “Femtosecond pulses in the mid-infrared generated by downconversion of a traveling-wave dye laser,” Opt. Lett. 16, 411–413 (1991).
[Crossref] [PubMed]

P. Hamm, C. Lauterwasser, and W. Zinth, “Generation of tunable subpicosecond light pulses in the midinfrared between 4.5 and 11.5 μm,” Opt. Lett. 18, 1943–1945 (1993).
[Crossref] [PubMed]

M. R. X. de Barros, R. S. Miranda, T. M. Jedju, and P. C. Becker, “High-repetition-rate femtosecond midinfrared pulse generation,” Opt. Lett. 20, 480–482 (1995).
[Crossref] [PubMed]

C. Erny, K. Moutzouris, J. Biegert, D. Kühlke, F. Adler, A. Leitenstorfer, and U. Keller, “Mid-infrared difference-frequency generation of ultrashort pulses tunable between 3.2 and 4.8 μm from a compact fiber source,” Opt. Lett. 32, 1138–1140 (2007).
[Crossref] [PubMed]

G. M. Gale, G. Gallot, F. Hache, and R. Sander, “Generation of intense highly coherent femtosecond pulses in the mid infrared,” Opt. Lett. 22, 1253–1255 (1997).
[Crossref] [PubMed]

F. Seifert, V. Petrov, and M. Woerner, “Solid-state laser system for the generation of midinfrared femtosecond pulses tunable from 3.3 to 10 μm,” Opt. Lett. 19, 2009–2011 (1994).
[Crossref] [PubMed]

F. Rotermund, V. Petrov, F. Noack, V. Pasiskevicius, J. Hellström, and F. Laurell, “Efficient femtosecond traveling-wave optical parametric amplification in periodically poled KTiOPO4,” Opt. Lett. 24, 1874–1876 (1999).
[Crossref]

G. Cirmi, D. Brida, C. Manzoni, M. Marangoni, S. De Silvestri, and G. Cerullo, “Few-optical-cycle pulses in the near-infrared from a non-collinear optical parametric amplifier,” Opt. Lett. 32, 2396–2398 (2007).
[Crossref] [PubMed]

J. Piel, M. Beutter, and E. Riedle, “20–50-fs pulses tunable across the near infrared from a blue-pumped noncollinear parametric amplifier,” Opt. Lett. 25, 180–182 (2000).
[Crossref]

N. Demirdöven, M. Khalil, O. Golonzka, and A. Tokmakoff, “Dispersion compensation with optical materials for compression of intense sub-100-fs mid-infrared pulses,” Opt. Lett. 27, 433–435 (2002).
[Crossref]

Phys. Rev. Lett. (3)

A. Baltusˇka, T. Fuji, and T. Kobayashi, “Controlling the Carrier-Envelope Phase of Ultrashort Light Pulses with Optical Parametric Amplifiers,” Phys. Rev. Lett. 88, 133901 (2002).
[Crossref]

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Figures (4)

Fig. 1.
Fig. 1. (a). Calculated signal-idler group-velocity mismatch at 800 nm pump wavelength for several nonlinear optical crystals with extended mid-IR transparency. (b) Group velocity mismatch between signal and pump for the same crystals. PPLN, periodically poled lithium niobate; PPSLT, periodically poled stoichiometric lithium tantalate.
Fig. 2.
Fig. 2. (a,b). Calculated frequency dependence of the parametric gain for 2-mm-thick 800-nm pumped LiIO3, KNbO3 and PPSLT crystals, assuming phase-matching at zero GVM point; (c,d) complete simulation of signal and idler bandwidths for LiIO3 according to the model described in the text.
Fig. 3.
Fig. 3. Experimental setup; BS, beam splitter; DL, delay line; SHG, second-harmonic generation; WLG, white light generation; DM, dichroic mirror; Au, gold mirror. In the first stage it is possible to switch from 800-nm pumped LiIO3 to 400-nm pumped BBO, substituting the λ/2 plate with a SHG crystal (BBO, 1 mm, type I, θ = 29°).
Fig. 4.
Fig. 4. Idler spectra from the second stage.

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