Abstract

Abstract: We report on the lasing in air and pure nitrogen gas pumped by a single 800 nm femtosecond laser pulse. Depending on gas pressure, incident laser power and beam convergence, different lasing lines are observed in the forward direction with rapid change of their relative intensities. The lines are attributed to transitions between vibrational and rotational levels of the first negative band of the singly charged nitrogen molecule-ion. We show that self-seeding plays an important role in the observed intensity changes.

© 2013 OSA

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    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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2013 (2)

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

2012 (3)

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

2011 (4)

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

A. Dogariu, J. B. Michael, M. O. Scully, and R. B. Miles, “High-gain backward lasing in air,” Science331(6016), 442–445 (2011).
[CrossRef] [PubMed]

M. N. Shneider, A. Bakuška, and A. M. Zheltikov, “Population inversion of molecular nitrogen in an Ar: N2 mixture by selective resonance-enhanced multiphoton ionization,” J. Appl. Phys.110(8), 083112 (2011).
[CrossRef]

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

2009 (3)

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

P. Maioli, R. Salamé, N. Lascoux, E. Salmon, P. Béjot, J. Kasparian, and J. P. Wolf, “Ultraviolet-visible conical emission by multiple laser filaments,” Opt. Express17(6), 4726–4731 (2009).
[CrossRef] [PubMed]

2007 (1)

A. Couairon and A. Mysyrowicz, “Femtosecond filamentation in transparent media,” Phys. Rep.441(2-4), 47–189 (2007).
[CrossRef]

2005 (1)

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

2003 (1)

Q. Luo, W. Liu, and S. L. Chin, “Lasing action in air driven by ultra-fast laser filamentation,” Appl. Phys. B76(3), 337–340 (2003).
[CrossRef]

2000 (1)

Y. D. Qin, H. Yang, C. J. Zhu, and Q. Gong, “Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air,” Appl. Phys. B71(4), 581–584 (2000).
[CrossRef]

1995 (1)

1994 (1)

1984 (1)

R. S. Kunabenchi, M. R. Gorbal, and M. I. Savadatt, “Nitrogen lasers,” Prog. Quantum Electron.9(4), 259–329 (1984).
[CrossRef]

Ališauskas, S.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Andriukaitis, G.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Bakuška, A.

M. N. Shneider, A. Bakuška, and A. M. Zheltikov, “Population inversion of molecular nitrogen in an Ar: N2 mixture by selective resonance-enhanced multiphoton ionization,” J. Appl. Phys.110(8), 083112 (2011).
[CrossRef]

Baltuška, A.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Barkauskas, M.

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

Béjot, P.

Beresna, M.

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

Cameron, S.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Cheng, Y.

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Chin, S. L.

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Q. Luo, W. Liu, and S. L. Chin, “Lasing action in air driven by ultra-fast laser filamentation,” Appl. Phys. B76(3), 337–340 (2003).
[CrossRef]

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

Chu, W.

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Couairon, A.

A. Couairon and A. Mysyrowicz, “Femtosecond filamentation in transparent media,” Phys. Rep.441(2-4), 47–189 (2007).
[CrossRef]

Daigle, J. F.

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

Danielius, R.

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

Dogariu, A.

A. Dogariu, J. B. Michael, M. O. Scully, and R. B. Miles, “High-gain backward lasing in air,” Science331(6016), 442–445 (2011).
[CrossRef] [PubMed]

Gong, Q.

Y. D. Qin, H. Yang, C. J. Zhu, and Q. Gong, “Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air,” Appl. Phys. B71(4), 581–584 (2000).
[CrossRef]

Gorbal, M. R.

R. S. Kunabenchi, M. R. Gorbal, and M. I. Savadatt, “Nitrogen lasers,” Prog. Quantum Electron.9(4), 259–329 (1984).
[CrossRef]

He, F.

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

Hemmer, P. R.

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

Hornkohl, J. O.

Jing, C.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

Ju, J.

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

Kartashov, D.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Kasparian, J.

Kazansky, P. G.

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

Kocharovsky, V.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Kunabenchi, R. S.

R. S. Kunabenchi, M. R. Gorbal, and M. I. Savadatt, “Nitrogen lasers,” Prog. Quantum Electron.9(4), 259–329 (1984).
[CrossRef]

Lascoux, N.

Lehmann, K.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Lewis, J. W. L.

Li, G.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Li, H.

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

Li, R.

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

Liu, W.

Q. Luo, W. Liu, and S. L. Chin, “Lasing action in air driven by ultra-fast laser filamentation,” Appl. Phys. B76(3), 337–340 (2003).
[CrossRef]

Lucht, R.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Luo, Q.

Q. Luo, W. Liu, and S. L. Chin, “Lasing action in air driven by ultra-fast laser filamentation,” Appl. Phys. B76(3), 337–340 (2003).
[CrossRef]

Luther, G. G.

Maioli, P.

Meyer, M.

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

Michael, J. B.

A. Dogariu, J. B. Michael, M. O. Scully, and R. B. Miles, “High-gain backward lasing in air,” Science331(6016), 442–445 (2011).
[CrossRef] [PubMed]

Miles, R.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Miles, R. B.

A. Dogariu, J. B. Michael, M. O. Scully, and R. B. Miles, “High-gain backward lasing in air,” Science331(6016), 442–445 (2011).
[CrossRef] [PubMed]

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

Moloney, J. V.

Mysyrowicz, A.

A. Couairon and A. Mysyrowicz, “Femtosecond filamentation in transparent media,” Phys. Rep.441(2-4), 47–189 (2007).
[CrossRef]

Newell, A. C.

Ni, J.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Parigger, C.

Plemmons, D. H.

Plenge, J.

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

Polynkin, P.

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

Pugžlys, A.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Qin, Y. D.

Y. D. Qin, H. Yang, C. J. Zhu, and Q. Gong, “Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air,” Appl. Phys. B71(4), 581–584 (2000).
[CrossRef]

Raschpichler, C.

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

Rostovtsev, Y.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Rühl, E.

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

Salamé, R.

Salmon, E.

Savadatt, M. I.

R. S. Kunabenchi, M. R. Gorbal, and M. I. Savadatt, “Nitrogen lasers,” Prog. Quantum Electron.9(4), 259–329 (1984).
[CrossRef]

Scully, M. O.

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

A. Dogariu, J. B. Michael, M. O. Scully, and R. B. Miles, “High-gain backward lasing in air,” Science331(6016), 442–445 (2011).
[CrossRef] [PubMed]

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Shneider, M.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Shneider, M. N.

M. N. Shneider, A. Bakuška, and A. M. Zheltikov, “Population inversion of molecular nitrogen in an Ar: N2 mixture by selective resonance-enhanced multiphoton ionization,” J. Appl. Phys.110(8), 083112 (2011).
[CrossRef]

Siebert, T.

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

Sokolov, A. V.

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

Sprangle, P.

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

Svirko, Y.

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

Wang, T.

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

Warren, W.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Welch, G. R.

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Wirsing, A.

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

Wolf, J. P.

Wright, E. M.

Xie, H.

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

Xu, H.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Xu, Z.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Yang, H.

Y. D. Qin, H. Yang, C. J. Zhu, and Q. Gong, “Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air,” Appl. Phys. B71(4), 581–584 (2000).
[CrossRef]

Yao, J.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Yuan, S.

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

Zeng, B.

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Zhang, C.

Zhang, H.

J. Ni, W. Chu, C. Jing, H. Zhang, B. Zeng, J. Yao, G. Li, H. Xie, C. Zhang, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation,” Opt. Express21(7), 8746–8752 (2013).
[CrossRef] [PubMed]

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Ni, W. Chu, H. Zhang, C. Jing, J. Yao, H. Xu, B. Zeng, G. Li, C. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “Harmonic-seeded remote laser emissions in N₂-Ar, N₂-Xe and N₂-Ne mixtures: a comparative study,” Opt. Express20(19), 20970–20979 (2012).
[CrossRef] [PubMed]

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

Zheltikov, A.

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Zheltikov, A. M.

M. N. Shneider, A. Bakuška, and A. M. Zheltikov, “Population inversion of molecular nitrogen in an Ar: N2 mixture by selective resonance-enhanced multiphoton ionization,” J. Appl. Phys.110(8), 083112 (2011).
[CrossRef]

Zhu, C. J.

Y. D. Qin, H. Yang, C. J. Zhu, and Q. Gong, “Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air,” Appl. Phys. B71(4), 581–584 (2000).
[CrossRef]

Appl. Opt. (1)

Appl. Phys. B (2)

Y. D. Qin, H. Yang, C. J. Zhu, and Q. Gong, “Intense femtosecond laser-induced second-harmonic generation in atmospheric-pressure air,” Appl. Phys. B71(4), 581–584 (2000).
[CrossRef]

Q. Luo, W. Liu, and S. L. Chin, “Lasing action in air driven by ultra-fast laser filamentation,” Appl. Phys. B76(3), 337–340 (2003).
[CrossRef]

Appl. Phys. Lett. (1)

M. Beresna, P. G. Kazansky, Y. Svirko, M. Barkauskas, and R. Danielius, “High average power second harmonic generation in air,” Appl. Phys. Lett.95(12), 121502 (2009).
[CrossRef]

Europhys. Lett. (1)

W. Chu, B. Zeng, J. Yao, H. Xu, J. Ni, G. Li, H. Zhang, F. He, C. Jing, Y. Cheng, and Z. Xu, “Multiwavelength amplified harmonic emissions from carbon dioxide pumped by mid-infrared femtosecond laser pulses,” Europhys. Lett.97(6), 64004 (2012).
[CrossRef]

J. Appl. Phys. (1)

M. N. Shneider, A. Bakuška, and A. M. Zheltikov, “Population inversion of molecular nitrogen in an Ar: N2 mixture by selective resonance-enhanced multiphoton ionization,” J. Appl. Phys.110(8), 083112 (2011).
[CrossRef]

J. Chem. Phys. (1)

J. Plenge, A. Wirsing, C. Raschpichler, M. Meyer, and E. Rühl, “Chirped pulse multiphoton ionization of nitrogen: control of selective rotational excitation in N2+(B2Σu+),” J. Chem. Phys.130(24), 244313 (2009).
[CrossRef] [PubMed]

Laser Phys. Lett. (1)

T. Wang, J. Ju, J. F. Daigle, S. Yuan, R. Li, and S. L. Chin, “Self-seeded forward lasing action from a femtosecond Ti:Sapphire laser filament in air,” Laser Phys. Lett. (to be published).

New J. Phys. (1)

J. Yao, G. Li, C. Jing, B. Zeng, W. Chu, J. Ni, H. Zhang, H. Xie, C. Zhang, H. Li, H. Xu, S. L. Chin, Y. Cheng, and Z. Xu, “Remote creation of coherent emissions in air with two-color ultrafast laser pulses,” New J. Phys.15(2), 023046 (2013).
[CrossRef]

Opt. Express (3)

Opt. Lett. (1)

Phys. Rep. (1)

A. Couairon and A. Mysyrowicz, “Femtosecond filamentation in transparent media,” Phys. Rep.441(2-4), 47–189 (2007).
[CrossRef]

Phys. Rev. A (2)

J. Yao, B. Zeng, H. Xu, G. Li, W. Chu, J. Ni, H. Zhang, S. L. Chin, Y. Cheng, and Z. Xu, “High-brightness switchable multiwavelength remote laser in air,” Phys. Rev. A84(5), 051802 (2011).
[CrossRef]

D. Kartashov, S. Ališauskas, G. Andriukaitis, A. Pugžlys, M. Shneider, A. Zheltikov, S. L. Chin, and A. Baltuška, “Free-space nitrogen gas laser driven by a femtosecond filament,” Phys. Rev. A86(3), 033831 (2012).
[CrossRef]

Proc. Natl. Acad. Sci. U.S.A. (2)

P. R. Hemmer, R. B. Miles, P. Polynkin, T. Siebert, A. V. Sokolov, P. Sprangle, and M. O. Scully, “Standoff spectroscopy via remote generation of a backward-propagating laser beam,” Proc. Natl. Acad. Sci. U.S.A.108(8), 3130–3134 (2011).
[CrossRef] [PubMed]

V. Kocharovsky, S. Cameron, K. Lehmann, R. Lucht, R. Miles, Y. Rostovtsev, W. Warren, G. R. Welch, and M. O. Scully, “Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere,” Proc. Natl. Acad. Sci. U.S.A.102(22), 7806–7811 (2005).
[CrossRef] [PubMed]

Prog. Quantum Electron. (1)

R. S. Kunabenchi, M. R. Gorbal, and M. I. Savadatt, “Nitrogen lasers,” Prog. Quantum Electron.9(4), 259–329 (1984).
[CrossRef]

Science (1)

A. Dogariu, J. B. Michael, M. O. Scully, and R. B. Miles, “High-gain backward lasing in air,” Science331(6016), 442–445 (2011).
[CrossRef] [PubMed]

Other (2)

D. Kartashov, J. Möhring, G. Andriukaitis, A. Pugžlys, A. Zheltikov, M. Motzkus, and A. Baltuška, “Stimulated amplification of UV emission in a femtosecond filament using adaptive control,” Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science and Photonic Applications Systems Technologies, Technical Digest (CD) (Optical Society of America, 2012), paper QTh4E.6.
[CrossRef]

W. Chu, G. Li, H. Xie, J. Ni, J. Yao, B. Zeng, H. Zhang, C. Jing, H. Xu, Y. Cheng, and Z. Xu, “Self-induced white-light seeding laser in a femtosecond laser filament,” Las. Phys. Lett. (to be published). http://www.arxiv.org/abs/1308.4032 .

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Figures (4)

Fig. 1
Fig. 1

(a) and (c), Spectrum intensity of the forward lasing radiations in air (a) and nitrogen gas (c) as a function of gas pressure. The focal length was f = 40 cm. The incident laser energy was 3.5 mJ in (a) and slightly higher, about 4 mJ, in (c). (b) Zoomed spectrum around 391 nm for pressure p = 30 mbar in Fig. 1(a). (d), Zoomed spectrum around 400 nm for pressure p = 4 mbar in Fig. 1 (c).

Fig. 2
Fig. 2

Intensity of the lasing radiation around 391 nm (left) and 428 nm (right) as a function of nitrogen gas pressure. The focal length was 40 cm in (a) and (b), 75 cm in (c) and (d).

Fig. 3
Fig. 3

Intensity dependence of the 391 nm (a) and 428 nm (b) lasing radiation on the incident laser pulse energy. The nitrogen pressure for (a) and (b) are 150 mbar and 600 mbar, respectively.

Fig. 4
Fig. 4

(a)- (c), Spatial profile of the 391 nm emission at different nitrogen pressure. From (a) to (c), the pressure are 5 mbar, 15 mbar, and 25 mbar, respectively. (d) – (f), Spatial profile of the 428 nm lasing radiation. The pressures are 100 mbar, 300 mbar, and 800 mbar from (d) to (f). The angle of view of each panel is 60 × 40 mrad. The white lines on the right of each panel present the vertical line-cut of each intensity distribution on the center.

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