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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 299–307

Simple method of measuring laser peak intensity inside femtosecond laser filament in air

Shengqi Xu, Xiaodong Sun, Bin Zeng, Wei Chu, Jiayu Zhao, Weiwei Liu, Ya Cheng, Zhizhan Xu, and See Leang Chin  »View Author Affiliations

Optics Express, Vol. 20, Issue 1, pp. 299-307 (2012)

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Measurement of laser intensity inside a femtosecond laser filament is a challenging task. In this work, we suggest a simple way to characterize laser peak intensity inside the filament in air. It is based on the signal ratio measurement of two nitrogen fluorescence lines, namely, 391 nm and 337 nm. Because of distinct excitation mechanisms, the signals of the two fluorescence lines increase with the laser intensity at different orders of nonlinearity. An empirical formula has been deduced according to which laser peak intensity could be simply determined by the fluorescence ratio.

© 2011 OSA

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(260.5950) Physical optics : Self-focusing
(300.6410) Spectroscopy : Spectroscopy, multiphoton

ToC Category:
Nonlinear Optics

Original Manuscript: November 2, 2011
Revised Manuscript: November 26, 2011
Manuscript Accepted: November 26, 2011
Published: December 20, 2011

Shengqi Xu, Xiaodong Sun, Bin Zeng, Wei Chu, Jiayu Zhao, Weiwei Liu, Ya Cheng, Zhizhan Xu, and See Leang Chin, "Simple method of measuring laser peak intensity inside femtosecond laser filament in air," Opt. Express 20, 299-307 (2012)

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