集成量子压缩光源中MgO∶LiNbO3晶体倍频系统研究  

Frequency Doubling System for Integrated Quantum Squeezed Light Source Based on MgO∶LiNbO3 Crystal

作　　者：田宇航 王俊萍 杨文海 田龙[1,3] 王雅君 郑耀辉[1,3] Yuhang Tian;Junping Wang;Wenhai Yang;Long Tian;Yajun Wang;Yaohui Zheng(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan,Shanxi 030006,China;China Academy of Space Technology(Xi'an),Xi'an,Shanxi 710100,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,Shanxi 030006,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]中国空间技术研究院西安分院,陕西西安710100 [3]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》2020年第11期250-257,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(11654002,11874250,11804207);国家重点研发计划(2016YFA0301401);山西省三晋学者特聘教授项目;山西省重点研发计划(201903D11001);山西省“1331”重点建设学科;山西省高等学校中青年拔尖创新人才;山西省应用基础研究计划(201801D221006);陕西省自然科学基础研究计划项目(2019JQ-943)

摘　　要：基于掺氧化镁铌酸锂晶体,采用临界相位匹配技术以及半整块腔型结构进行外腔倍频实验并制备了532 nm激光。对热透镜效应引起的倍频腔模式失配进行了理论分析。在较高基频光注入倍频腔时,通过重新进行模式匹配,缓解了模式失配对倍频转换效率的影响,最终可实现最大倍频转换效率为(49.3±0.45)%的倍频过程,对应输出功率为567.0 mW。通过模式清洁器改善了输出532 nm激光的光束质量并有效降低了其强度噪声,最终实现了输出功率为470 mW、光束质量因子为1.05的低噪声532 nm激光,其在分析频率1.65 MHz处达到散粒噪声极限。此倍频系统结构紧凑,输出功率稳定,可为集成量子压缩光源提供有效泵浦光场,在量子精密测量以及量子信息科学等领域中发挥重要作用。Based on the MgO∶LiNbO3 crystal,the critical phase matching technology and the semi-monolithic cavity structure are used to perform external cavity frequency doubling and generate 532 nm laser.The mismatch of the frequency-doubling cavity modes caused by the thermal lens effect is theoretically analyzed.When the higher fundamental frequency light is injected into the frequency-doubling cavity,the mode matching is performed again to mitigate the effect of mode mismatch on the frequency doubling conversion efficiency.Finally,the frequency doubling process with the maximum frequency doubling conversion efficiency of(49.3±0.45)%is achieved and the corresponding output power is 567.0 mW.Furthermore,the model cleaner can not only improve the 532 nm laser beam quality but also reduce the intensity noise to realize the output power of 470 mW and the beam quality factor of 1.05 for the low-noise green laser,whose shot noise limit is reached at an analysis frequency of 1.65 MHz.The whole frequency doubling system possesses a compact structure,a stable output power,and can supply an effective pump field for the quantum squeezed light source,and thus it can play an important role in quantum precision measurement and quantum information fields.

关 键 词：非线性光学 倍频 二次谐波 临界相位匹配 532 nm激光 掺氧化镁铌酸锂晶体 

分 类 号：TN24[电子电信—物理电子学] TQ131.11[化学工程—无机化工]