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Numerical investigation of the dependence of stimulated Brillouin scattering threshold on the pump intensity fluctuation

Published online by Cambridge University Press:  24 June 2019

Xuehua Zhu ,
Guanling Wang  and
Daohua Wu
Xuehua Zhu
Affiliation:
School of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China Department of Engineering Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-shi, Tokyo, 182-8585, Japan
Guanling Wang*
Affiliation:
School of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
Daohua Wu
Affiliation:
School of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China
*
Author for correspondence: Guanling Wang, School of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China. E-mail: ahpuwgl@163.com
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Abstract

In this paper, the dependence of stimulated Brillouin scattering (SBS) threshold on the sinusoidal modulated properties of pump pulse is studied. A 527-nm-wavelength, 5 ns square laser pulse with sinusoidal temporal modulation is used as the pump source, and a 600 mm liquid heavy fluorocarbon material FC-40 is used as the Brillouin medium. The numerically calculated results indicate that the SBS threshold increases with the increase of both temporal intensity modulation index and modulation frequency of the pump pulse. However, when the intensity distortion criterion is below 30% or the duration of modulation peaks below three times the phonon lifetime, the SBS threshold tends to remain stable. The numerical results provide assistance to judge the SBS threshold for unsmoothed pump pulses, especially for high power laser applications.

Keywords

Intensity fluctuationstimulated Brillouin scatteringthreshold
Type
Research Article
Information
Laser and Particle Beams , Volume 37 , Issue 2 , June 2019 , pp. 231 - 234
Copyright
Copyright © Cambridge University Press 2019 

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