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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 16 — Aug. 11, 2014
  • pp: 19005–19013

Gain dynamics of a free-space nitrogen laser pumped by circularly polarized femtosecond laser pulses

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

Optics Express, Vol. 22, Issue 16, pp. 19005-19013 (2014)

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We experimentally demonstrate ultrafast dynamic of generation of the 337-nm nitrogen laser by injecting an external seed pulse into a femtosecond laser filament pumped by a circularly polarized laser pulse. In the pump-probe scheme, it is revealed that the population inversion between the C3Πu and B3Πg states of N2 for the free-space 337-nm laser is firstly built up on the timescale of several picoseconds, followed by a relatively slow decay on the timescale of tens of picoseconds, depending on the nitrogen gas pressure. By measuring the intensities of 337-nm signal from nitrogen gas mixed with different concentrations of oxygen gas, it is also found that oxygen molecules have a significant quenching effect on the nitrogen laser signal. Our experimental observations agree with the picture of electron-impact excitation.

© 2014 Optical Society of America

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Lasers and Laser Optics

Original Manuscript: May 23, 2014
Revised Manuscript: July 12, 2014
Manuscript Accepted: July 21, 2014
Published: July 29, 2014

Jinping Yao, Hongqiang Xie, Bin Zeng, Wei Chu, Guihua Li, Jielei Ni, Haisu Zhang, Chenrui Jing, Chaojin Zhang, Huailiang Xu, Ya Cheng, and Zhizhan Xu, "Gain dynamics of a free-space nitrogen laser pumped by circularly polarized femtosecond laser pulses," Opt. Express 22, 19005-19013 (2014)

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