人眼安全波段全固态单频激光器研究进展  

Research Progress on Eye-Safe All-Solid-State Single-Frequency Lasers

作　　者：王庆[1,2,3] 高春清 Wang Qing;Gao Chunqing(School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Information Photonics Technology,Ministry of Industry and Information Technology,Beijing 100081,China;Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]信息光子技术工业和信息化部重点实验室,北京100081 [3]光电成像技术与系统教育部重点实验室,北京100081

出　　处：《中国激光》2021年第5期61-75,共15页Chinese Journal of Lasers

基　　金：国家重点研发计划(2017YFB0405203)。

摘　　要：人眼安全波段单频激光可作为相干多普勒测风、相干成像及大气中甲烷、二氧化碳等气体浓度差分探测激光雷达的光源。针对激光雷达对单频激光器的应用需求,本文综述了1.6μm波段、2μm波段连续及脉冲全固态单频激光器的研究进展;对单频激光的不同纵模选择方法、不同注入锁定控制方法、种子注入锁定及主振荡功率放大技术的特点进行了对比分析;对人眼安全波段全固态单频激光器的未来发展前景进行了展望。Significance Due to their narrow spectral range,single-frequency lasers have the advantage of long coherence length due;thus,such lasers are widely used in coherent detection.Recently,the demand for atmospheric aerosol detection,wind field information,atmospheric gas concentration distribution,and coherent imaging have become urgent.A pulsed single-frequency laser source is significant for coherent laser detection.Single-frequency laser pulses with high output pulse energy are required for long-distance coherent detection.To avoid the scattering of a single-frequency-pulsed laser in the atmosphere from damaging the human eye,the light source of a lidar system must consider the safety of laser irradiation.According to the International Electrotechnical Commission IEC60825 international application standard and laser safety classification method,1.4-2.6μm laser irradiation is less harmful to human eyes than 1.06μm laser irradiation under the same laser pulse energy.Thus,the 1.4-2.6μm band is called eye safety band.The eye-safe laser is represented by the 1.6-μm band output generated with an erbium-doped gain medium and the 2-μm band output generated with a holmium-doped gain medium.In recent years,with the development of 1.4-1.5μm and 1.9-μm laser diodes and resonant pumping technology,Er^(3+)doped single-frequency lasers~1.6μm and the Ho^(3+)doped single-frequency lasers~2μm have been greatly promoted.The 1.6-μm band locates in the communication band and the atmospheric window.The corresponding devices,such as detectors are more mature and efficient.Therefore,the 1.6μm band is more suitable for long-distance lidar.One output line of Er∶YAG is~1.65μm,and there are characteristic absorption peaks of CH4 gas;therefore,a single-frequency laser at 1.645μm can be used for differential absorption detection of methane.Tm^(3+)and Ho^(3+)lasers~2μm are also located in the atmospheric window and have higher atmospheric transmittance than 1.6μm lasers.Additionally,Ho∶YLF single-frequency lasers at a wavelen

关 键 词：激光器 单频激光器 人眼安全波段 注入锁定 主振荡功率放大器 

分 类 号：TN21[电子电信—物理电子学]