光参变振荡器的红外光谱研究

Study on Infrared Spectrum of Optical Parametric Oscillator

对宽调谐周期极化掺镁铌酸锂光参变振荡器（OPO）进行了实验研究,OPO的抽运源采用的是激光二极管端面抽运的声光调QNd：YVO4激光器,其谐振腔由两个凹面镜构成了简单的线性腔,凹面镜的衬底材料选用氟化钙。通过改变周期极化掺镁铌酸锂晶体的温度（30~80℃）和极化周期（29.0~31.5μm）,OPO实现了信号光波长在1450~1700 nm和闲频光波长在2849.0~3989.4 nm范围内的宽调谐输出。对OPO输出的光谱进行了测量,信号光光谱的半峰全宽均小于0.58 nm,闲频光光谱的半峰全宽小于4 nm。实验结果表明,实测的信号光与闲频光的波长调谐曲线与理论模拟结果非常吻合。

A experimental study of widely tunable periodically poled MgO：LiNbO3（PPMgLN） optical parametric oscillator（OPO） is presented.The laser diode（LD） end-pumped acousto-optically（A-O） Q-switched Nd：YVO4 laser was used as the pump source of OPO.The OPO resonator consisted of a two CaF2 concave mirror linear cavity.By varying temperature（30~80 ℃） and poling periods（29.0~31.5 μm） of PPMgLN crystal,the signal wavelength was tunable in the range of 1450~1700 nm as well as the idle wavelength was tuned from 2849.0~3989.4 nm.The measured full width at half maximum（FWHM） of the output signal and idler ware were about 0.58 and 4 nm or less,respectively.The results indicate that the experimental data agrees well with the calculated tuning curve.