适用于水下同步照明的灯泵浦绿光激光器研制

Development of a Green Laser Pumped by Flash Lamp Applicable to Underwater Synchronous Lightening

研制了脉冲宽度大、单脉冲能量大的绿光激光器,其中脉冲重复频率与高速相机帧频同步,且光纤耦合输出.激光器采用平凸非稳腔结构,灯泵浦Nd∶YAG晶体,KTP晶体内腔倍频,被动调Q方式,实现了最大重复频率为300Hz、脉冲宽度为70μs、平均功率为38W、单脉冲能量为126.7mJ、光束发散角为3.5mrad的532nm激光输出.将该激光耦合到芯径为800μm的光纤中进行水下实验,耦合效率达到92%.

Green laser with large pulse width and high single pulse energy was developed,which has a pulse repetition frequency synchronized with high speed camera frame frequency and is applicable for fiber coupling output.Together with the application of plano-convex unstable resonator,the laser was equipped with a flash-lamp pumped Nd∶YAG crystal,a KTP crystal for intracavity frequency doubling and a passive Q-switching crystal.A laser light output was realized with a wavelength of 532 nm,the maximum repetition rate was 300 Hz,the pulse width was 70μs,the average power was 38 W,the single pulse energy was 126.7 mJ and the divergence angle was 3.5 mrad.The laser was further coupled to an underwater fiber of 800μm in diameter,achieving a 92%coupling efficiency.