非临界相位匹配KTP光学参量振荡器的研究

Noncritically Phase Matched KTP Optical Parametric Oscillator

对电光调Q(Ce,Nd):YAG激光抽运内腔非临界相位匹配(NCPM)光参量振荡器(IOPO)进行了实验研究,实验发现IOPO输出光波长为532 nm、632 nm、1 064 nm、1 100 nm和1 571 nm 5种。OPO输出镜对信号光反射率较大时,信号光出现多脉冲,可以通过控制信号光反射率,使信号光为单脉冲。信号光能量随着抽运能量增加到一定值后出现饱和。

Type Ⅱ noncritically phase matched KTP optical parametric oscillator is an important method to achieve 1.57 μm eye-safe laser at high repetition frequency with high output energy. The noncritically phase matched intra-cavity optical parametric oscillator （IOPO） pumped by electro-optical Q-switched （Ce,Nd）：YAG laser is experimentally researched. The results show that output wavelengths include 532 nm, 632 nm, 1 064 nm, 1 100 nm and 1 571 nm. When the OPO output mirror has high signal reflectivity, multi-pulses are produced. The single pulse is obtained by proper signal reflectivity. Increasing the energy of pumping wavelength, the energy of signal beam will be saturated.