报道了基于准相位匹配(QPM)应用的周期性极化钽酸锂(PPSLT)晶体进行腔内倍频非线性光学变换实验研究。分析比对了不同长度(3.5 mm,5 mm,10 mm)晶体倍频过程。利用3.5 mm PPSLT晶体在2500 mW 808 nm激光抽运下产生1445 mW 1064 nm基频光输出,经过倍频可以得到760 mW的绿光输出。同时对于制约倍频效果和效率提高的系统温度控制等问题进行了分析。

Research on intra-cavity second harmonic generation using periodically poled stoichiometric LiTaO₃ (PPSLT) based on quasi phase matching (QPM) is reported. Periodically poled crystals with different lengths (3.5 mm,5 mm,10 mm) are compared and examined. For the 3.5 mm PPSLT,1445 mW fundamental wave of 1064 nm could be achieved in condition of 2500 mW pump of 808 nm,then 760 mW green light of 532 nm could be achieved through second harmonic generation (SHG). Problems on system temperature control that affect SHG efficiency are also analyzed.