摘要
高分七号(GF-7)卫星激光测高仪激光器是一台输出能量较大、光束质量要求又高的激光器。为了实现这样的技术要求,采用被动调Q的振荡级+两级板条放大器(MOPA)的技术路线,以激光二极管(LD)侧面泵浦的被动调Q之字形薄板条激光器作为振荡级,以实现近衍射极限的种子光输出,再通过两级之字形板条放大器,使最终输出的大能量激光束能够保持较好的光束质量,满足测高仪小足印光斑的要求。设计的振荡级采用双玻罗(Porro)镜谐振腔,实现输出能量2 mJ、光束质量因子(M 2)1.3、脉冲宽度3 ns。经过两级板条放大器后,输出光束M 2为1.5~1.8,单脉冲能量达到180 mJ,脉冲宽度为4~5 ns,证明激光器设计合理,可以作为对地观测类激光测高仪激光器的设计参考。
The technical requirement for the laser transmitter of GF-7 satellite altimeter is both high energy and high beam quality.To realizing this requirement,the MOPA(master oscillator and power amplifier)stage is applied in this laser.The master oscillator is designed as a LD pumped passive Q-switched zigzag slab laser,outputting a 3ns width,near diffraction limit and low energy laser pulse.Passing through the two-stage amplifier,the pulse energy is amplified though the beam quality is still remain in good,so as to realize a small foot print for altimeter.A cross Porro cavity is used in the oscillator,the output energy of mater oscillator is 2mJ,the beam quality factor M 2 is 1.3,and the pulse width is 3ns.After two-stage amplifier,the pulse energy is more than 180mJ,the M 2 is 1.5~1.8,and the pulse width is 4~5ns,which verifies the design is reasonable.This paper gives the design reference for the laser transmitter for earth observation laser altimeter.
作者
孟俊清
张鑫
蒋静
吴姚芳
谢可迪
魏森涛
王晋伟
王志君
陈卫标
MENG Junqing;ZHANG Xin;JIANG Jing;WU Yaofang;XIE Kedi;WEI Sentao;WANG Jinwei;WANG Zhijun;CHEN Weibiao(Key Laboratory of Space Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)
出处
《航天器工程》
CSCD
北大核心
2020年第3期96-102,共7页
Spacecraft Engineering
基金
国家重大科技专项工程。
关键词
高分七号卫星
全固态激光器
被动调Q
板条放大器
GF-7 satellite
all solid state laser
passive Q-switched laser
slab amplifier
