被动调Q激光脉冲周期的研究

详细信息

Study on periodicity of giant pulses with passive Q-switched laser

摘要: 针对存在激发态吸收(ESA)的被动式调Q激光器,采用绝热近似(AEA)方法和微分方程的Hopf分岔条件,将被动调Q产生的多脉冲序列与由光强和反转粒子数密度所构成相平面上的极限环运动对应起来,得到了产生Q脉冲阈值的定量关系式和表示脉冲周期(重复频率)的解析解。解释了Cr4+:YAG调Q激光器的有关现象,获得了与有关实验相一致的结果。
- 被动式调Q /
- 绝热近似 /
- Hopf分岔
Abstract: For passive Q-switched solid state lasers including excite state absorption (ESA),the coupled rate equations is presented. By means of the adiabatic elimination approximation (AEA) and the Hopf bifurcation conditions,the series of multi-pulses produced by passive Q-switch correspond to the limit cycle on the phase plane of optic intensity and population inversion density. Threshold formula for giant pulses and analytical solution for pulses period or repetitive frequency are obtained. The phenomena about Cr4+:YAG saturable absorber Q-switched laser are explained. The calculated results accord with the experiment.
- passive Q-switch /
- adiabatic elimination approximation (AEA) /
- Hopf bifurcation

[1]	丁育明.激光杂志,1997;18(6):1
[2]	Eicher H J,Haose A,Kokta M R et al.Appl Phys,1994;B58(5):409
[3]	朱长虹,李正佳,刘安平et al.激光与红外,1993;23(5):42
[4]	李福利.高等激光物理学.合肥:中国科学技术大学出版社,1992:85
[5]	王加贤,张文珍,王清月et al.光学学报,1998;18(8):984
[6]	欧阳斌,丁彦华,万少珂et al.光学学报,1996;16(12):1666
[7]	Tarasov L V.Laser Physics.Moscow:MIR,1983:287
[8]	陆启韶.分岔与奇异性.上海:上海科技教育出版社,1995:109
[9]	Narducci L M,Abraharm N B.Laser Physics and Laser Instabilities.Singapore:World Scientific,1998:268
[10]	丁彦华,欧阳斌,徐军et al.中国激光,1997;A24(3):197
[11]	Verdeyen J T.Laser Electronics.2th Edition,New Jersey:Prentice Hall,1989:318