中国光学（中英文）2024，Vol.17Issue(5)：1068-1074,7.DOI:10.37188/CO.2023-0210
内腔式非稳腔DF激光光束质量研究
Study on beam quality of DF laser with inner cavity unstable resonator
摘要
Abstract
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.关键词
DF激光器/内腔式/虚共焦非稳腔/光束质量Key words
DF laser/inner cavity/positive branch confocal unstable resonator/beam quality分类
信息技术与安全科学引用本文复制引用
阮鹏,汪玉海,潘其坤,邵春雷,陈飞,郭劲..内腔式非稳腔DF激光光束质量研究[J].中国光学（中英文）,2024,17(5):1068-1074,7.基金项目
吉林省自然科学基金项目(No.20220101207JC) （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) （No.SKLLIM2115）
State Key Laboratory of Laser Interaction with Matter Project(No.SKLLIM2115) （No.SKLLIM2115）
