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Self-pumped SBS effect of high-power super-Gaussian-shaped laser pulses

Published online by Cambridge University Press:  09 December 2015

Yulei Wang ,
Xuehua Zhu ,
Zhiwei Lu  and
Hengkang Zhang
Yulei Wang
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
Xuehua Zhu
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
Zhiwei Lu*
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
Hengkang Zhang
Affiliation:
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China
*
Address correspondence and reprint requests to: Zhiwei Lu, National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, P. O. Box 3031, Harbin 150080, China. E-mail: zw_lu@sohu.com
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Abstract

Most of the high-energy laser systems deliver temporally super-Gaussian-shaped laser pulses. The propagation properties of this kind of pulses in a nonlinear medium are studied in this paper. There is Stokes component in the sideband spectrum of super-Gaussian-shaped pulses, and the frequency difference between the Stokes component and the center frequency is equals to the Brillouin frequency of the nonlinear medium. When the laser is reflected by optical elements in the light path, Stokes component in the reflected light can be amplified by the subsequent part of the laser pulse and excite stimulated Brillouin scattering (self-pumped SBS). The self-pumped SBS is studied theoretically and experimentally, and the experimental results agreed well with the calculated results. The simulation results show that lower-order super-Gaussian-shaped pulses are more suitable for suppressing the self-pumped SBS and of great benefit to the energy delivering of the high-power laser pulses. To the best of our knowledge, this is the first time to experimentally demonstrate the self-pumped SBS of high-power super-Gaussian-shaped laser pulses.

Keywords

Self-pumped SBSHigh-power lasersSuper-Gaussian-shaped laser pulses
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 1 , March 2016 , pp. 72 - 79
Copyright
Copyright © Cambridge University Press 2015 

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