18 February 2009 Highly stabilized laser intensity during ultra-short laser filamentation
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In this work, we investigate the stability of the nitrogen fluorescence signal emitted by a femtosecond laser filament as an example of a high order nonlinear optical process. It is found that the root-mean-square fluctuation of the fluorescence signal emitted from the filament is less than 1 %. The corresponding estimated laser intensity fluctuation is as low as 0.14%, which is at least one order of magnitude lower than the input laser pulse power fluctuation. Further numerical simulation has confirmed that the intensity clamping phenomenon is responsible for this observation. Since the intensity clamping is an intrinsic property of filamentation phenomenon, it is expected that any intensity sensitive optical interaction taking place inside filament could lead to highly stabilized outcome. This conclusion potentially affects various applications of ultra-short laser filamentation.
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Shengqi Xu, Shengqi Xu, Yizhu Zhang, Yizhu Zhang, Weiwei Liu, Weiwei Liu, } "Highly stabilized laser intensity during ultra-short laser filamentation", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 727614 (18 February 2009); doi: 10.1117/12.823856; https://doi.org/10.1117/12.823856


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