高功率连续波单频589 nm金刚石钠导星激光器研究(特邀)  

High-power Single-frequency Continuous 589 nm Diamond Sodium Guide Laser(Invited)

作　　者：尤崴 杨学宗 孙玉祥 李牧野 姜华卫 陈迪俊[1,2,5] 陈卫标 冯衍[1,2,5] YOU Wei;YANG Xuezong;SUN Yuxiang;LI Muye;JIANG Huawei;CHEN Dijun;CHEN Weibiao;FENG Yan(Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University,Taiyuan 030006,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]中国科学院大学杭州高等研究院,杭州310024 [3]山东大学晶体材料国家重点实验室,济南250100 [4]山西大学量子光学与光量子器件国家重点实验室,太原030006 [5]中国科学院大学,北京100049

出　　处：《光子学报》2023年第5期10-19,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62005073);国家重点研究发展计划(No.2020YFC2200300);山东大学晶体材料国家重点实验室开放课题(No.KF2101);量子光学与光量子器件国家重点实验室开放课题(No.KF202207);河北省自然科学基金(No.F2020202026)。

摘　　要：面向天文观测等领域对高功率单频589 nm钠导星激光器的应用需求,通过金刚石拉曼谐振及腔内倍频技术结合1018 nm掺镱光纤激光技术,实现了最高功率16.5 W的连续波单频589 nm钠导星激光器研制。建立外腔拉曼振荡及腔内倍频理论,详细分析谐振腔输出耦合率和倍频晶体相位匹配条件对输出激光功率的影响。激光光谱宽度为16 MHz,光束质量因子为1.05,光光转化效率为20%。Single-frequency 589 nm laser can resonate with sodium atoms in the sodium layer(altitude of~100 km)to generate intense return fluorescence which is used as a bright beacon for adaptive optics and is essential for large aperture telescopes to observe the universe clearly.This Sodium Guide Star Laser(SGSL)technology is of intense interest for applications in astronomical observation,space debris tracking,ground to space communication and mesospheric magnetometry.Due to the lack of efficient direct inversion gain medium at 589 nm and the strict requirements for laser output power and spectral linewidth,it is challenging to generate suitable SGSL.In this paper,we demonstrated a high-power single-frequency SGSL based on diamond Raman laser with intracavity Second Harmonic Generation(SHG).The laser operated in single longitudinal mode is due to the combination spatial-hole-burning-free Raman gain mechanism and harmonic self-suppression of axial-longitudinal modes.The pump was a linearly-polarized Yb-doped fiber laser at 1018 nm with 3 dB spectral linewidth of 15.7 GHz and maximum output power of 82 W.The dimension of the diamond crystal was 7 mm×4 mm×1.2 mm and the Type Ⅰ SHG crystal was LiB3O5(LBO)cut at θ=90°,ϕ=0°with the dimension of 10 mm×4 mm×4 mm.The directions of 1018 nm pump polarization,diamond<111>axis and LBO slow axis were aligned parallel to each other,providing the highest Raman gain and SHG angle match.The output coupling of the resonator at Stokes wavelength was 0.03%.At the LBO temperature of 37.8℃,the SHG power increased up to a maximum of 16.5 W with a beam quality of M^(2)=1.05 at the pump power of 82 W.The optical-to-optical conversion efficiency from 1018 nm to 589 nm was 20%.The SHG output spectrum was measured using a scanning F-P interferometer and had a 3 dB linewidth of 16 MHz.Thus,the power spectral density of the SHG was 197 times higher than that of the pump.An analytical model about the external cavity Raman laser with intracavity SHG is adapted and used to predict the SHG an

关 键 词：固体激光器 单纵模激光器 金刚石 钠导星激光器 二次谐波产生 

分 类 号：TN248[电子电信—物理电子学]