Yan Xingpeng, Liu Qiang, Fu Xing, Chen Hailong, Gong Mali, Wang Dongsheng
State Key Laboratory of Tribology, Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University, Beijing, China.
Opt Express. 2009 Nov 23;17(24):21956-68. doi: 10.1364/OE.17.021956.
We demonstrate the high-repetition rate acousto-optic Q-switching of a dual-rod Nd:YVO4 laser. Two thermally bonded composite YVO4-Nd:YVO4-YVO4 rod crystals were used as the gain medium to reduce the serious thermal effect. The pump mode and its influence on the laser mode were analyzed, and the effective pump radius was controlled by tuning the spectrum of laser diodes with adjustment on the temperature of laser diodes. Three different configurations of cavity optics were designed and the output performance using these cavities was investigated. In Q-switching operation, 73.2 W TEM00 mode average power at 650 kHz was obtained. The stable Q-switching range was from 80 kHz to 650 kHz with the pulse duration increasing from 17.5 ns to 80 ns. In CW operation, 78 W TEM00 mode and 93 W multi-mode output power was achieved with different cavity designs, corresponding to the optical-optical efficiency of 46.5% and 52.2% respectively.
我们展示了双棒Nd:YVO4激光器的高重复频率声光调Q特性。采用两块热键合的复合YVO4-Nd:YVO4-YVO4棒状晶体作为增益介质，以降低严重的热效应。分析了泵浦模式及其对激光模式的影响，并通过调节激光二极管温度来调整其光谱，从而控制有效泵浦半径。设计了三种不同的腔镜配置，并研究了使用这些腔镜时的输出性能。在调Q运行中，获得了650kHz下73.2W的TEM00模平均功率。稳定的调Q范围为80kHz至650kHz，脉冲持续时间从17.5ns增加到80ns。在连续波运行中，通过不同的腔镜设计分别实现了78W的TEM00模和93W的多模输出功率，对应的光光效率分别为46.5%和52.2%。
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