PPKTP晶体半整体谐振腔倍频的397.5nm紫外激光输出  

Generation of 397.5 nm Ultra-Violet Laser by Frequency Doubling in a PPKTP-Crystal Semi-Monolithic Resonant Cavity

作　　者：温馨[1] 韩亚帅[1] 何军[1] 王彦华[1] 杨保东[1] 王军民[1] 

机构地区：[1]山西大学光电研究所量子光学与光量子器件国家重点实验室,山西太原030006

出　　处：《光学学报》2016年第4期196-202,共7页Acta Optica Sinica

基　　金：国家863计划(2012CB921601);国家自然科学基金(61227902;61475091;11274213;61205215)

摘　　要：外腔谐振倍频是获得397.5 nm紫外激光的重要方法。搭建了基于周期极化的磷酸氧钛钾(PPKTP)晶体的半整体谐振腔,对经半导体锥型放大器放大的795 nm单频连续激光进行谐振倍频。在203 m W的795 nm基频光输入条件下,实现了60.4 m W的397.5 nm连续单频紫外激光输出,倍频转化效率为30%;在基频光功率约87.5 m W时,得到最大的倍频效率约为34.6%。倍频紫外光光束质量因子M2优于1.21,光束质量良好,30 min内典型的倍频光功率均方根起伏小于1.9%。该倍频器结构紧凑,具有很好的机械稳定性,可实现紫外激光的稳定输出,可用于产生对应铷原子跃迁线的压缩、纠缠态光场,在量子光学和精密测量等领域发挥重要作用。Frequency doubling in an external cavity is a prevalent method to generate an ultra-violet laser at 397.5 nm. A semi-monolithic resonant frequency doubling cavity based on the PPKTP crystal is built and is used to realize the resonant frequency doubling of the 795 nm single frequency continuous-wave laser amplified via a semiconductor tapered amplifier. Under the condition of 203 mW input power of a 795 nm laser, the 397.5 nm single frequency continuous-wave ultra-violet laser with a power of 60.4 mW is obtained, and the frequency doubling conversion efficiency is 30%; and the maximum doubling efficiency is 34.6% with a fundamental power of about 87.5 mW. The beam quality factor M2 of the frequency doubling ultra-violet laser is superior to 1.21, indicating the better beam quality. The typical root-mean-square fluctuation of the output power within 30 min is less than 1.9%. This frequency doubler is compact, has good mechanical stability, and can be used to achieve steady output of ultra- violet laser. The ultra-violet laser can be used to generate the squeezed or entangled states of the rubidium transition line, and plays an important role in the quantum optics, precise measurement and other fields.

关 键 词：激光光学 倍频 半整体谐振腔 PPKTP晶体 半导体锥型放大器 铷原子 

分 类 号：O437[机械工程—光学工程]