为了对抽运源的稳频技术做出对比和选择, 采用内调制技术和相位调制光外差技术, 以周期性极化KTP晶体作为非线性晶体, 实现了894.6nm连续光两镜驻波倍频腔的稳频运转。结果表明, 在不同注入光功率下, 用这两种方法锁定倍频腔后获得的蓝光功率基本相同; 在最大注入光功率为350mW时, 获得178mW的447.3nm蓝光, 相应的转化效率为50.8%;在最大注入光功率下, 利用内调制技术和相位调制光外差稳频技术获得的蓝光在2h内功率起伏分别为3.4%和2.3%。该研究对获得稳定输出的447.3nm蓝光用来制备铯原子D1线的非经典光的实验是有帮助的。

In order to compare and select the technology of locking frequency of pump source, by using intra-modulation technology and Pound-Drever-Hall(PDH) technology separately, and choosing periodically poled KTP(PPKTP) crystal as nonlinear crystal, stable frequency operation of 894.6nm continuous light two-mirror standing wave frequency doubling cavity was realized. The results show that frequency doubling cavity has the same blue light power output using two locking technologies and under different input light powers. 447.3nm blue light of 178mW is obtained when the maximum fundamental light power of 350mW and the corresponding conversion efficiency is 50.8%. Under the condition of the maximum fundamental power, the power fluctuation of blue light obtained by intra-modulation technology and PDH technology are 3.4% and 2.3% in 2h respectively. The research is helpful for preparing stable output of 447.3nm blue light to obtain nonclassical light source at D1 line of cesium atom.