Noncritically Phase Matched KTP Optical Parametric Oscillator

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.