LD抽运声光调Q 1064nm窄脉宽激光器  

Narrow Pulse Width Laser Diode Pumped Acousto-Optically Q-Switched 1064 nm Laser

作　　者：董小龙[1] 付喜宏[2] 高兰兰[1] 张帆[1] 焦石[1] 纪冠东 

机构地区：[1]长春理工大学理学院,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,吉林长春130033

出　　处：《激光与光电子学进展》2014年第9期135-139,共5页Laser & Optoelectronics Progress

摘　　要：激光二极管(LD)抽运固体激光器(SSLs)通过声光(A-O)调Q方法获得的短脉冲激光在激光测距、激光雷达等领域有着广泛的应用。从调Q速率方程出发,通过理论分析与合理的模拟,解释了脉冲输出平均功率和脉冲宽度与反转粒子数密度之间的关系。为了获得脉宽相对较窄的脉冲输出,在平-平谐振腔结构中使用LD单端抽运偏振吸收与发射的Nd:YVO4晶体,在抽运电流为32.6 A,重复频率为33.5 kHz,腔长为62 mm,输出镜透射率为50%的条件下获得了最短脉冲宽度为4.4 ns的脉冲激光输出。在抽运电流为31.6 A,腔长为77 mm的条件下,获得脉冲宽度为5.5 ns、峰值功率为26 kW的1064 nm脉冲激光输出。并且讨论了腔长、重复频率以及输出耦合镜透射率与脉冲宽度的变化关系。Narrow pulse laser can be obtained from laser diode （LD） pumped acousto-optically （A-O） Q-switched all solid state lasers （SSLs）, which is useful in many applications such as laser ranging, laser radar, etc. According to Q-switching rate equation, the relationships between pulse average power, pulse width and inverted population density are explained by theoretical analysis and reasonable model. LD side pumped Nd：YVO4 crystal which is polarized absorption and emission in a flat-flat cavity is used to achieve narrower pulse width. On conditions that the pumped current is 32.6 A, the repetition rate is 33.5 kHz, the cavity length is 62 mm, the transmittance is 50%, the shortest pulse width of 4.4 ns is obtained. On conditions that the pumped current is 31.6 A, the cavity length is 77 mm, a 1064 nm laser output with the pulse width of 5.5 ns and the peak power of 26 kW is obtained. Cavity length, repetition rate and transmittance of output mirror as functions of pulse width have been discussed.

关 键 词：激光器 激光二极管抽运固体激光器 窄脉宽 声光调Q 有效储能时间 

分 类 号：O437[机械工程—光学工程]