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Investigation on effect of medium temperature upon SBS and SBS optical limiting

Published online by Cambridge University Press:  30 October 2009

W.L.J. Hasi ,
X.Y. Guo ,
H.H. Lu ,
M.L. Fu ,
S. Gong ,
X.Z. Geng ,
Z.W. Lu ,
D.Y. Lin  and
W.M. He
W.L.J. Hasi
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
X.Y. Guo
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
H.H. Lu
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
M.L. Fu
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
S. Gong
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
X.Z. Geng
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
Z.W. Lu*
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
D.Y. Lin
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
W.M. He
Affiliation:
Institute of Opto-electronics, Harbin Institute of Technology, Harbin, China; National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, China
*
Address correspondence and reprint requests to: Z.W. Lu, Institute of Opto-electronics, Harbin Institute of TechnologyP.O. Box 3031, Harbin 150080, China. E-mail: zw_lu@sohu.com
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Abstract

The effect of medium temperature upon characteristic of stimulated Brillouin scattering (SBS) and SBS optical limiting is investigated. The physical mechanism behind is analyzed theoretically and experimentally verified in Continuum's Nd: YAG Q-switched laser system using FC-72 as the SBS medium. The temperature affects the electrostrictive coefficient, refractive index, density and acoustic velocity of the medium weakly. In contrast, the kinematic viscosity, which is inversely proportional to the temperature, is related to gain coefficient and phonon lifetime and thus greatly affects the SBS characteristics. Therefore, in the low temperature, the kinematic viscosity is usually high, which can lead to a small gain coefficient and a short phonon lifetime. Therefore, the SBS characteristic can be changed by controlling the temperature to a great extent.

Keywords

Medium temperaturePhonon lifetimeSBS optical limitingStimulated Brillouin scattering
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 4 , December 2009 , pp. 733 - 737
Copyright
Copyright © Cambridge University Press 2009

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