小型全光纤耦合非平面环形腔固体激光器  

Compact All Fiber Coupled Nonplanar Ring Oscillator Solid-State Laser

作　　者：孙广伟[1,2] 辛国锋 朱韧[1] 陈迪俊[1,3] 冯盼[1] 侯霞 蔡海文 陈卫标[1,3] Sun Guangwei;Xin Guofeng;Zhu Ren;Chen Dijun;Feng Pan;Hou Xia;Cai Haiwen;Chen Weibiao(Spaceborne Laser Engineering Department,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,Zhejiang,China)

机构地区：[1]中国科学院上海光学精密机械研究所航天激光工程部,上海201800 [2]中国科学院大学,北京100049 [3]国科大杭州高等研究院物理与光电工程学院,江苏杭州310024

出　　处：《中国激光》2022年第13期8-14,共7页Chinese Journal of Lasers

基　　金：国家重点研发计划(2020YFC2200300,2020YFB0408300);国家自然科学基金(61775225,61875214,61805260);中国科学院战略性先导科技专项(XDB43000000);上海自然科学基金(21ZR1472100)。

摘　　要：研制了一种小型全光纤耦合非平面环形腔固体激光器,在1.5 W的808 nm半导体激光器泵浦下,单模保偏光纤耦合输出功率近600 mW,线宽小于200 Hz,偏振对比度优于20 dB。对该激光器的调谐、频率稳定性、功率稳定性等性能进行了研究,该激光器通过了力学试验(随机振动均方根加速度为19.8g,其中g为重力加速度)和温度试验(-20~+65℃),试验前后输出功率变化小于5%,可以用于对力学环境和温度环境要求较高的场合。Objective Since the advent of lasers,a single-frequency laser has always been a key research direction of lasers.A single-frequency all-solid-state laser has the advantages of narrow linewidth and stable frequency,which is widely used in lidar,gravity wave detection,coherent communication,and so on.Many research institutions and enterprises have studied the tunable performance,frequency performance,and noise characteristics of nonplanar ring oscillator(NPRO)single-frequency lasers.However,most researches are based on the cavity structure to develop a desktop test system.And commercial products are difficult to meet the requirements of narrow linewidth,small volume,and high reliability,and thus difficult to meet the requirements of space field.The greatest particularity of space laser is the particularities of test environment and operation environment.The laser has to experience not only vibration and shock,but also the rapid changes of atmospheric pressure and temperature in the process of laser emission.These raise high requirements for the performance and reliability of the laser.Therefore,it is necessary to develop a laser with characteristics of miniaturization,high performance,and high reliability,which can adapt to the extreme space environment and ensure the normal operation in orbit.Methods In this study,we design a new structure of an NPRO crystal with a dimension of 12 mm(length)×8 mm(width)×3mm(height).First,to achieve a single frequency output and high slope efficiency,the transmission of the coupling coating is optimized to 97%for s-polarization and 85%for p-polarization.Then we develop a small all fiber coupled nonplanar ring cavity solid-state laser.The device is mainly composed of pump fiber assembly,Nd∶YAG NPRO crystal,and coupled fiber assembly.The beam from the pump fiber is first focused by lens and then injected into the NPRO crystal.The beam from the NPRO crystal is focused into the coupled fiber.The core diameter of the pump fiber is 105μm with a numerical aperture of NA=0.22.The coup

关 键 词：激光器 非平面环形腔 窄线宽 稳定性 力学试验 温度试验 

分 类 号：TN248.1[电子电信—物理电子学]