介绍了一台连续激光二极管(LD)端面泵浦声光调Q的高重复频率、高效率1.53 μm人眼安全光学参量振荡激光器。激光基质材料采用Nd:YVO4晶体,采用按Ⅱ类非临界相位匹配切割、长20 mm的KTA晶体作为非线性光学晶体。在LD泵浦功率13.7 W,声光调Q重复频率60 kHz时,获得最高平均功率2.6 W的1.53 μm信号光输出,泵浦光-信号光转换效率达到19%。在最高输出功率2.6 W下测得单脉冲宽度2.9 ns,对应的单脉冲能量和峰值功率分别为43.3 μJ和15 kW。

A highly efficient high-repetition-rate CW laser diode end-pumped acousto-optically (AO) Q-switched eye-safe intracavity optical parametric oscillator at 1.53 μm was experimentally investigated. The 20 mm long KTA crystal cut for typeⅡ noncritical phase matching was adopted as the nonlinear crystal parametric converter in this experiment. We have achieved the signal average power of 2.6 W under the LD pumping power of 13.7 W and the pulse repetition rate of 60 kHz,corresponding to an optical-to-optical conversion efficiency of 19%. At the highest output power of 2.6 W,the signal pulse duration of 2.9 ns was obtained,corresponding to the single pulse energy of 43.3 μJ and peak power of 15 kW,respectively.