Numerically modeling and optimizing pulse-shape of Cr4+：YAG Q-switched lasers

XIONG Ji-chuan; LAN Ge; WAN Yong

In order to study the symmetry property of a single pulse for passively Q-switched lasers,the coupled rate equations were solved numerically and the temporal profile of laser pulse was obtained.The relationship between the symmetry property of a single pulse and the parameters of absorber and output coupler was presented and the pulsewidth was recalculated accounting for the asymmetry property of laser pulse.The relationship between pulsewidth and parameteres of absorber and output coupler was presented also.Conclusion was drawn that the pulse was symmetric when the variable b=0.6 and that the pulsewidth was minimal when b=0.78.This provides a method to optimize the pulse shape and pulsewidth by adjusting the value of b.

Corresponding author: LAN Ge, office@xiwu.net;

1. Southwest Institute of Technical Physics, Chengdu 610041, China

Received Date: 2007-04-20

Accepted Date: 2007-08-20

Available Online: 2008-08-25

Abstract: In order to study the symmetry property of a single pulse for passively Q-switched lasers,the coupled rate equations were solved numerically and the temporal profile of laser pulse was obtained.The relationship between the symmetry property of a single pulse and the parameters of absorber and output coupler was presented and the pulsewidth was recalculated accounting for the asymmetry property of laser pulse.The relationship between pulsewidth and parameteres of absorber and output coupler was presented also.Conclusion was drawn that the pulse was symmetric when the variable b=0.6 and that the pulsewidth was minimal when b=0.78.This provides a method to optimize the pulse shape and pulsewidth by adjusting the value of b.

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Reference (10)

[1]	LIU J G,SHEN D Y,TAM S Ch,et al.Modeling pulse shape of Q-switched lasers[J].IEEE J Q E,2001,37(7):888-896.
[2]	DEGNAN J J.Theory of the optimally coupled Q-switched laser[J].IEEE J Q E,1989,25(2):214-220.
[3]	DEGNAN J J.Optimization of passively Q-switched lasers[J].IEEE J Q E,1995,31(11):1890-1901.
[4]	ZAYHOWSKI J J,KELLEY P L.Optimization of Q-switched lasers[J].IEEE J Q E,1991,27(9):2220-2225.
[5]	XIAO G H,BASS M.A generalized model of passively Q-switched lasers including excited state absorption in the saturable absorber[J].IEEE J Q E,1997,33(1):41-44.
[6]	ZHU Ch H,LI Zh J,CHEN Sh Sh,et al.Study on periodicity of giant pulse with passive Q-switched laser[J].Laser Technology,2000,24(2):85-89(in Chinese).
[7]	LU Ch Y,WANG X B,GUO Y L,et al.Study on directional prism improving the output stability of Q-switched by Cr4+:YAG[J].Laser Technology,2005,29(2):187-189(in Chinese).
[8]	CHEN X Y,ZHAO G,WANG Y Zh.Study on miniature Cr4+:YAG Q-switched repetitively conductive cooling(Ce,Nd):YAG laser[J].Laser Technology,2000,24(2):114-118(in Chinese).
[9]	ZHANG X Y,ZHAO Sh Zh,WANG Q P,et al.Optimization of Cr4+-doped saturable-absorber Q-switched lasers[J].IEEE J Q E,1997,33(12):2286-2293.
[10]	SIEGMAN A E.Laser[M].Mill Valley,CA:University Science,1986:1037.

Numerically modeling and optimizing pulse-shape of Cr4+：YAG Q-switched lasers

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通讯作者: 陈斌, bchen63@163.com

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