基于MgO∶PPLN晶体的1560 nm激光外腔谐振倍频器  

1560 nm Laser External Cavity Resonant Frequency Doubler Based on MgO∶PPLN Crystal

作　　者：姜振宇 冯晋霞[1,2] 孙婧可 李渊骥 张宽收[1,2] Jiang Zhenyu;Feng Jinxia;Sun Jingke;Li Yuanji;Zhang Kuanshou(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 330006,Shanxi,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 033005,Shanxi,China)

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 [2]山西大学极端光学协同创新中心,山西太原030006

出　　处：《中国激光》2022年第17期1-8,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(62175135)。

摘　　要：报道了一台基于掺氧化镁周期极化铌酸锂(MgO∶PPLN)晶体的1560nm激光外腔谐振倍频器。理论分析了MgO∶PPLN晶体的极化周期容差、吸收损耗以及热透镜效应导致的倍频腔模式匹配效率变化对外腔谐振倍频效率的影响,实验搭建了由国产的MgO∶PPLN晶体和反射腔镜构成的外腔谐振倍频腔,实验研究了不同长度的MgO∶PPLN晶体对外腔谐振倍频效率的影响,并设计出小型化外腔谐振倍频器。利用长度为10mm的MgO∶PPLN倍频晶体,控制MgO∶PPLN晶体的温度为53.45℃,注入功率为1.7W的1560nm基频光,此时最佳谐振倍频效率达84.1%,倍频激光在3h内的输出功率稳定性优于±0.17%。所研制的小型化稳定输出780nm激光的外腔谐振倍频器可用于1560nm非经典光场的制备和基于铷原子的量子存储研究。Objective An important resource for realizing long-distance quantum communication is the 1560 nm nonclassical state light field because it produces a low loss window for optical fiber transmission.The most effective method to generate a 1560 nm nonclassical state light field is to pump an optical parametric amplifier using a 780 nm laser.Additionally,780 nm lasers correspond to the D2 line of 87Rb used in scientific fields,such as atomic cooling,frequency standard,and quantum storage.Therefore,methods for obtaining a highly efficient and stable 780-nm laser have become a widespread concern.With the rapid development of quasi-phase-matching technology,the high-efficiency frequency conversion of multiple lasers with different wavelengths is realized using the external cavity resonance frequency doubling technology based on periodic polarization nonlinear crystal.The external cavity-resonant frequency doubler with a high efficiency based on customized high-quality frequency doubling cavity mirrors and low loss periodically poled potassium titanyl phosphate(PPKTP)crystals are used.However,the PPKTP crystal relies heavily on imports,which restricts the development of native relevant technologies,thereby making it difficult to realize large-scale industrial applications.A periodically poled lithium niobate(PPLN)crystal has a highly effective nonlinear coefficient,especially because manufacturing PPLN crystal is relatively easy.Many native companies can produce high-quality PPLN crystals.However,PPLN crystals need to operate above 90℃to avoid photorefractive damage effects,which inconvenience practical application.MgO-doped PPLN(MgO∶PPLN)crystals have the same nonlinear coefficient as PPLN,but can greatly improve the photorefractive damage threshold.To develop a practical external cavity-resonant frequency doubler using the MgO∶PPLN crystal,studying the external cavity-resonant frequency doubling process systematically using domestic MgO∶PPLN crystal and cavity mirror is necessary.Methods First,we theoretically

关 键 词：激光器 外腔谐振倍频 准相位匹配晶体 高效率 小型化 

分 类 号：TN248.1[电子电信—物理电子学]