用于空间碎片探测的百赫兹3.31 J高光束质量全固态Nd:YAG激光器  

A 100 Hz 3.31 J all-solid-state high beam quality Nd:YAG laser for space debris detecting

作　　者：樊仲维[1,2,3] 邱基斯[1,2,4] 唐熊忻[1,2,4] 白振岙[1,2,4] 康治军[1,2,4] 葛文琦[1,2,4] 王昊成[1,2] 刘昊[1] 刘悦亮[1] 

机构地区：[1]中国科学院光电研究院,北京100094 [2]国家半导体泵浦激光工程技术研究中心,北京100094 [3]中国科学院大学,北京100049 [4]中科和光(天津)应用激光技术研究所有限公司,天津3003044

出　　处：《物理学报》2017年第5期115-120,共6页Acta Physica Sinica

基　　金：国家重大科研装备研制项目(批准号:ZDYZ2013-2);科技部创新人才推进计划重点领域创新团队(批准号:2014RA4051);中国科学院青年创新促进会资助的课题~~

摘　　要：基于激光二极管侧面抽运棒状放大器的方式,研制了一台应用于空间碎片探测的高重复频率、高光束质量焦耳级的Nd:YAG纳秒激光器.激光器采用主振荡功率放大的结构,主要包括单纵模种子、预放大单元、受激布里渊散射相位共辄光束控制单元和能量提取单元四部分.在能量提取单元,为了减小热效应对光束质量的影响,降低了放大器的工作电流,采用了分束-放大-合束的方案.在重复频率100 Hz,单纵模种子注入单脉冲能量10.73μJ的条件下,获得了3.31 J的能量输出.输出激光的脉冲宽度为4,58 ns,远场光束质量为2.12倍衍射极限,能量稳定性(BMS)为0.87%.With the rapid development of space technology, human activities into space are increasing, thereby producing lots of space debris. And the space debris impact is the major cause for the mechanical damage to the space crafts and the main factor affecting the service life; it even endangers the life safety of the astronauts working outside the spacecraft and pose a threat to the astronomical observation and studies. Thus, the monitoring and early warning of space debris are gradually attracting wide attention. Obviously, laser detection as a good-directivity and strong anti-lamming active detecting means has a unique advantage in terms of a round-the-clock detection. Therefore, the developing of debris-detecting laser beam source becomes the most direct and effective means for increasing the space debris detection accuracy. The laser detecting ability is restricted by the laser beam quality, the pulse energy and the repetition frequency at the same time. The beam quality could affect the ability to detect and recognize space target. The bigger the laser pulse energy, the higher the repetition frequency and the smaller the detectable debris, the stronger the detecting ability will be. A good detection effect could be achieved at 80 100 Hz laser pulse repetition frequency. A further increase of the repetition frequency will greatly increase the difficulty and cost accordingly but the improvement of the detection performance is not obvious at all. Thus, repetition frequency around 100 Hz becomes the best choice for laser space debris detection. Based on the laser diode side-pumped rod-shaped amplifier, a high-repetition-frequency and high-beam-quality of joule level Nd：YAG nanosecond laser for space debris detection is developed in this work. The laser adopts MOPA structure, mainly including single longitudinal mode, pre-amplifier unit, SBS phase-conjugate beam control unit and energy extraction unit. In the energy extraction unit, beam splitting-amplifying-combining is adopted for reducing the thermal effect on be

关 键 词：二极管抽运 高重复频率 纳秒激光器 高光束质量 

分 类 号：TN248[电子电信—物理电子学]