【作者】 陈晓； 朱小磊； 李世光； 马秀华； 刘继桥； 陈卫标；

【Author】 Chen Xiao;Zhu Xiaolei;Li Shiguang;Ma Xiuhua;Liu Jiqiao;Chen Weibiao;Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences;

【机构】 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； 材料与光电研究中心中国科学院大学；

【摘要】 星载1645 nm波段积分路径差分吸收（IPDA）激光雷达可以对全球大气甲烷（CH₄）浓度分布进行有效测量,单频纳秒脉冲光参量振荡器（OPO）是实现该波段激光雷达发射源的重要技术手段。本文介绍了基于KTiOAsO₄晶体（KTA）的1645 nm单频纳秒脉冲OPO输出特性。该OPO以自行研制的1064 nm单频脉冲激光器作为泵浦,通过种子注入技术来实现单纵模运转。当泵浦单脉冲能量为11m J、重复频率为50Hz时,种子注入OPO输出能量达到1.8m J。该OPO输出脉冲中心频率抖动的均方根值（RMS）为9.8 MHz,平均线宽48 MHz,能够满足CH₄激光雷达对光源频域特性的要求。更多还原

【Abstract】 Space-borne integrated path differential absorption（IPDA） lidar at 1645 nm wavelength is an effective tool for global observation of methane（CH₄）.Single-frequency nanosecond optical parametric oscillator（OPO） is an important technique to realize the laser source of IPDA lidar at this wavelength.Asingle-frequency nanosecond OPO with potassium titanyl arsenate（KTA） cut for wavelengths around 1645 nm is built for this application.The OPO is pumped by a self-developed single-frequency pulsed laser at 1064 nm at 50 Hz repetition rate and frequency-stabilized by injection seeding to insure single-mode operation.The energy of the laser pulse from the OPO is 1.8 m J when the pump energy is 11 m J.The frequency fluctuation of the OPO is 10 MHz（root-mean-square,RMS） and the average lindwidth is 48 MHz,which fulfill the requirements of CH₄ IPDA lidar.更多还原