高效率非临界相位匹配KTP光学参量振荡器

Efficient Noncritically Phase-matched KTP Optical Parametric Oscillator

利用Nd∶YAG激光器1．064μm基频光抽运非临界相位匹配KTP（θ＝90°，＝0°）光学参量振荡器（OPO），获得1．57μm相干光和高达64％的能量转换效率，分析了非临界相位匹配方式对KTP晶体定离效应和接收角的影响，并对OPO的阈值、效率、输出的光束质量进行了讨论。

An eye-safe laser source at 1. 57 μm with a maximum 64% energy conversion efficiency is demonstrated by use of a noncritically phase-matched (θ = 90℃, = 0°) KTP optical parametric oscillator pumped by a 1. 064 μm Nd: YAG laser. The effects of the noncritical phase-matching method on the walkoff angle and the acceptance angle of KTP crystal are analyzed and the operation properties such as threshold, efficiency and output beam quality of the OPO are discussed.