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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8746–8752

Identification of the physical mechanism of generation of coherent N2+ emissions in air by femtosecond laser excitation

Jielei Ni, Wei Chu, Chenrui Jing, Haisu Zhang, Bin Zeng, Jinping Yao, Guihua Li, Hongqiang Xie, Chaojin Zhang, Huailiang Xu, See-Leang Chin, Ya Cheng, and Zhizhan Xu  »View Author Affiliations


Optics Express, Vol. 21, Issue 7, pp. 8746-8752 (2013)
http://dx.doi.org/10.1364/OE.21.008746


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Abstract

Recently, amplification of harmonic-seeded radiation generated through femtosecond laser filamentation in air has been observed, giving rise to coherent emissions at wavelengths corresponding to transitions between different vibrational levels of the electronic B2Σu+ and X2Σg+ states of molecular nitrogen ions [Phys. Rev. A. 84, 051802(R) (2011)]. Here, we carry out systematic investigations on its physical mechanism. Our experimental results do not support the speculation that such excellent coherent emissions could originate from nonlinear optical processes such as four-wave mixing or stimulated Raman scattering, leaving stimulated amplification of harmonic seed due to the population inversion generated in molecular nitrogen ions the most likely mechanism.

© 2013 OSA

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(260.5950) Physical optics : Self-focusing

ToC Category:
Nonlinear Optics

History
Original Manuscript: February 6, 2013
Revised Manuscript: March 13, 2013
Manuscript Accepted: March 25, 2013
Published: April 2, 2013

Citation
Jielei Ni, Wei Chu, Chenrui Jing, Haisu Zhang, Bin Zeng, Jinping Yao, Guihua Li, Hongqiang Xie, Chaojin Zhang, Huailiang Xu, See-Leang Chin, Ya Cheng, and Zhizhan Xu, "Identification of the physical mechanism of generation of coherent N2 + emissions in air by femtosecond laser excitation," Opt. Express 21, 8746-8752 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-7-8746


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