Author： Sun Xiaodong Zeng Tao Gao Hui Zhang Siwen Liu Weiwei
Publisher： IOP Publishing
E-ISSN： 1361-6455|48|9|94004-94012
ISSN： 0953-4075
Source： Journal of Physics B: Atomic, Molecular and Optical Physics, Vol.48, Iss.9, 2015-05, pp. : 94004-94012
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Abstract
In the present work, femtosecond laser filament generation by focusing the laser pulse with an axicon in air is studied at different input laser powers both experimentally and numerically. It is found that the length of the filament increases almost linearly with the input laser power. Moreover, the laser intensity inside the filament starts to saturate at a power much higher than the critical power of self-focusing for a Gaussian beam. We have also observed the laser pulse self-compression during nonlinear propagation. The shortest pulse duration could be obtained at the center of the effective focal region produced by the axicon.
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