内腔倍频被动调QNd∶YVO_4/KTP绿光的脉宽控制  

Control of the Pulse Width in a Passively Q-Switched Intracavity Frequency Doubling Nd∶YVO_4/KTP Green Laser

作　　者：李桂秋[1] 赵圣之[1] 杨克建[1] 武伟[1] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100

出　　处：《中国激光》2006年第1期1-5,共5页Chinese Journal of Lasers

基　　金：山东省科技发展计划项目(013060102);教育部博士点基金资助项目

摘　　要：分别改变饱和吸收体在激光腔内的位置及抽运光的束腰在激光晶体中的位置，实现了对激光二极管（LD）抽运Nd：Nd：YVO4／KTP腔内倍频Cr^4＋：YAG被动调Q绿光的脉宽控制。在抽运功率1．52w的条件下，脉冲宽度可以控制在388～616ns之间，同时获得了激光脉冲的重复频率、单脉冲能量及峰值功率的变化范围分别为4．4～26．3kHz，0．52～4．19μJ和1．0～7．2w。考虑腔内光子数密度的高斯空间分布以及抽运光的空间分布，给出了描述调Q激光器工作原理的耦合速率方程组，其数值解与实验结果相符。By varying the positions of the saturable absorber in the laser axis and the pump beam waist in the gain medium, respectively, the control of the pulse width in a laser diode pumped passively Q-switched Nd： YVO4/KTP green laser with Cr^4＋ ： YAG saturable absorber is realized. With a pump power of 1.52 W, the pulse width can be controlled in 388 - 616 ns, and the variations of pulse repetition rate, pulse energy and peak power are 4.4-26.3 kHz, 0.52 - 4.19 μJ and 1.0-7.2 W, respectively. A rate equation model is introduced, in which the intracavity photon density is assumed to be Gaussian spatial distribution and the pump beam spatial distribution is also considered. The numerical calculations of the rate equations are consistent with the experimental results.

关 键 词：激光技术 脉宽控制 被动调Q 速率方程 高斯空间分布 

分 类 号：TN248.1[电子电信—物理电子学]