内腔式非稳腔DF激光光束质量研究OA北大核心CSTPCD
Study on beam quality of DF laser with inner cavity unstable resonator
激光光束质量是衡量激光器应用性能的重要指标之一,面向远距离光电对抗应用场景,本文开展了非链式脉冲氟化氘(DF)激光器非稳腔设计和光束质量提升技术研究.设计了 3组不同放大倍率的正分支虚共焦非稳腔,搭建了凸面腔镜横向和轴向两种支撑结构的非稳腔实验装置,其中横向支撑结构内置循环水冷却通道.以 86.5%环围能量定义激光光斑大小,选用β因子评价激光光束质量,比较两种支撑方式下的输出能量和光束质量.研究发现:相同条件下,轴向支撑结构的非稳腔输出能量较横向支撑结构高 6%,但远场发散角较横向支撑大 9%;水冷横向支撑结构虽存在部分能量遮挡,但其较好的热稳定性显著提升了激光光束质量.在M=2.25的横向支撑内腔式非稳腔条件下获得了光束质量因子β=1.83、发散角θ0.865=0.63 mrad的激光光束.该条件下的激光单脉冲能量为 2.34 J,激光脉宽为 88.2 ns,峰值功率达到26.5 MW.
Laser beam quality is one of the key indicators to measure the application performance of laser.To meet the application requirements of long-distance optoelectronic countermeasures,we cany out the research on the design of unstable resonators and beam quality improvement techniques for non-chain pulsed deuteri-um fluoride(DF)lasers.Three sets of positive branch virtual confocal unstable resonators with different mag-nifications are designed.An inner cavity unstable resonator with two support structures of convex mirror,transverse support and longitudinal support,are constructed.The transverse support structure is equipped with a circulating water-cooling channel.Using 86.5%surrounding energy to define laser beam diameter,the laser beam quality is evaluated with beam quality factor β,and the energy and beam divergence for two sup-port types of convex mirrors are compared.It can be found that,under the same conditions,the laser energy of unstable resonators with longitudinal support is 6%higher than that of the transverse support structure,but the far-field divergence angle is 9%larger than that of the transverse support structure.Although the water-cooled transverse support structure has energy shielding,its good thermal stability significantly improves the quality of the laser beam.Laser beam with a beam quality factor β of 1.83 and a divergence angle θ0.865 of 0.63 mrad is obtained under the transverse support unstable resonator of M=2.25.Under this condition,the laser single pulse energy is 2.34 J,the laser pulse width is 88.2 ns,and the peak power reaches 26.5 MW.
阮鹏;汪玉海;潘其坤;邵春雷;陈飞;郭劲
吉林师范大学信息技术学院,吉林四平 136000中国科学院长春光学精密机械与物理研究所,吉林长春 130033
电子信息工程
DF激光器内腔式虚共焦非稳腔光束质量
DF laserinner cavitypositive branch confocal unstable resonatorbeam quality
《中国光学(中英文)》 2024 (005)
1068-1074 / 7
吉林省自然科学基金项目(No.20220101207JC);激光与物质相互作用国家重点实验室开放基础研究课题(No.SKLLIM2115) Supported by the Natural Science Foundation of Jilin Province(No.20220101207JC);State Key Laboratory of Laser Interaction with Matter Project(No.SKLLIM2115)
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