基于LiNbO_3晶体电光调Q的Cr,Tm,Ho:YAG激光器输出特性分析  

Output Properties of Cr,Tm,Ho:YAG Laser Based on Electro-Optical Q Switching of LiNbO_3 Crystal

作　　者：闫光[1] 冯国英[1] 杨火木[1] 阴明[1] 姚轲[1] 赵鸿[2] 周寿桓[1,2] 

机构地区：[1]四川大学电子信息学院,川成都610064 [2]华北光电技术研究所,北京100015

出　　处：《激光与光电子学进展》2013年第1期148-152,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60890200;10976017);固体激光技术国家级重点实验室基金资助课题

摘　　要：搭建了以布儒斯特角切割LiNbO3晶体作为电光调Q元件的Cr,Tm,Ho:YAG激光器,测量了静态时腔内LiNbO3晶体的放置角度对激光器输出能量以及偏振特性的影响。研究发现,当LiNbO3晶体以布儒斯特角放置时,Cr,Tm,Ho:YAG激光器效率最高,输出激光的p分量最大,线偏振特性最好,这对电光调Q是有利的。电光调Q时,测量了不同抽运电压下的输出能量、脉冲宽度及脉冲波形,当重复频率为2Hz时、脉冲能量为25mJ,最小脉宽达265ns,脉冲峰值功率达94.3kW,脉冲波形呈光滑的近高斯分布。Cr,Tm,Ho： YAG laser system based on Q switching of LiNbO3 with Brewster angle cut ends is developed. The influence of the angle by which the LiNbO3 crystal is placed on the output energy and polarization properties at free running regime is measured. The experimental results indicate that when the LiNbO3 crystal is placed in the Brewster angle, the laser will achieve the highest efficiency. Furthermore, the output beam has the largest p component and the best linear polarization properties, which are beneficial to the Q switching of Cr, Tm,Ho： YAG laser. The output energy, pulse width and pulse profile of Cr, Tin, Ho： YAG laser at various lamp voltages at Q switching regime are investigated. The maximum pulse energy of 25 mJ and the minimum pulse width of 265 ns at the repetition rate of 2 Hz are achieved, and the peak power is up to 94.3 kW. The pulse profile presents nearly smooth Gaussian distribution.

关 键 词：激光器 Cr Tm Ho:YAG激光器 LINBO3晶体 电光调Q 布儒斯特角 

分 类 号：TN248.1[电子电信—物理电子学]