用于海洋颗粒有机碳探测的高重复频率三波长激光器  

High⁃Repetition⁃Rate Three⁃Wavelength Laser for Particulate Organic Carbon Detection in Ocean

作　　者：马浩达 马剑[1,2] 陆婷婷 贺岩[1,2] 于广礼 丁建永[3] 朱小磊 Ma Haoda;Ma Jian;LuTingting;He Yan;Yu Guangli;Ding Jianyong;Zhu Xiaolei(Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Advanced All Solid State Laser Technology R&D Center,Nanjing Institute of Advanced Laser Technology,Nanjing 210038,Jiangsu,China)

机构地区：[1]中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049 [3]南京先进激光技术研究院先进全固态激光技术研发中心,江苏南京210038

出　　处：《中国激光》2024年第11期307-314,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFB3901701);国家自然科学基金(62205358);上海市“科技创新行动计划”社会发展科技攻关项目(21DZ1205400);中国科学院创新基金(CXJJ-22S005)。

摘　　要：研制了用于海洋颗粒有机碳(POC)高光谱探测雷达的激光源,采用稳频种子源结合光纤固体混合放大技术和非线性频率变换技术,获得了高重复频率多波长激光输出。采用1064 nm单频分布式反馈(DFB)半导体激光器作为种子源,通过碘分子吸收池,实现了对种子激光频率的稳定控制。种子激光经连续光纤放大后,用声光调制器将其斩波为重复频率为5 kHz的纳秒脉冲激光,再通过光纤固体混合级联放大、I类相位匹配三硼酸锂(LBO)晶体倍频及II类相位匹配LBO晶体和频,实现了355 nm激光输出。利用355 nm激光泵浦基于偏硼酸钡(BBO)晶体的光参量振荡器(OPO),最终获得了486 nm蓝光输出。当OPO光-光转换效率为26.9%时,三波长激光输出对应的单脉冲能量分别为2.24 mJ@1064 nm、0.53 mJ@532 nm、0.70 mJ@486 nm,脉冲宽度分别为17.0 ns@1064 nm、5.0 ns@532 nm、6.9 ns@486 nm。Objective Ocean carbon sequestration accounts for one-third of total plant carbon sequestration of the world,and particulate organic carbon(POC)is a major form of ocean-based carbon.Accurate detection of POC content can help China achieve the goal of carbon peak and neutrality.Light detection and ranging(LiDAR)active detection is the only known technology that can directly penetrate ocean bodies to realize the detection of marine euphotic zones.When the characteristic parameters of the phase,frequency,amplitude,and polarization of the optical signal are analyzed and the characteristics of the detected target are inverted,the vertical distribution of ocean POC over a long range can be obtained.A 532 nm frequency-doubled blue-green wavelength is typically used in ocean LiDAR systems,as lower attenuation is found at 532 nm in coastal waters.Additional research shows that if the laser wavelength of the LiDAR operates near the Fraunhofer dark lines of the solar spectrum,such as 518.36,486.13,and 434.05 nm,the interference of solar background noise on the laser ocean detection system can be effectively reduced.It can also improve the signal-tonoise ratio and extend the working period of the LiDAR system.This study proposes a high-repetition-frequency three-wavelength laser system that provides a new technical route for the development of a LiDAR light source for POC hyperspectral detection in oceans.Methods A multi-wavelength laser system for POC hyperspectral detection LiDAR with a high repetition rate is developed using a frequency-stabilized seed laser(Fig.1)combined with fiber-bulk hybrid amplification and nonlinear frequency conversion technologies(Fig.2).A 1064-nm distributed feedback(DFB)semiconductor laser with a linewidth of~1 MHz is used as the single-frequency continuous-wave(CW)seeder,and an iodine molecular absorption pool is designed to control the frequency stability.The seeder laser is chopped into nanosecond pulse trains with a repetition rate of 5 kHz using an acousto-optic modulator following continu

关 键 词：激光器 蓝光激光器 单频 三倍频 光参量振荡 海洋探测 

分 类 号：TN248.1[电子电信—物理电子学]