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内腔式非稳腔DF激光光束质量研究

阮鹏 汪玉海 潘其坤 邵春雷 陈飞 郭劲

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). doi: 10.37188/CO.2023-0210
引用本文: 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). doi: 10.37188/CO.2023-0210
RUAN Peng, WANG Yu-hai, PAN Qi-kun, SHAO Chun-lei, CHEN Fei, GUO Jin. Study on beam quality of DF laser with inner cavity unstable resonator[J]. Chinese Optics. doi: 10.37188/CO.2023-0210
Citation: RUAN Peng, WANG Yu-hai, PAN Qi-kun, SHAO Chun-lei, CHEN Fei, GUO Jin. Study on beam quality of DF laser with inner cavity unstable resonator[J]. Chinese Optics. doi: 10.37188/CO.2023-0210

内腔式非稳腔DF激光光束质量研究

doi: 10.37188/CO.2023-0210
基金项目: 国家重点实验室开放基础研究课题(No. SKLLIM2115)
详细信息
    作者简介:

    阮 鹏(1985—),女,博士,讲师,主要从事中红外激光技术及理论研究。E-mail:eagle_laser@163.com

  • 中图分类号: TN248.5

Study on beam quality of DF laser with inner cavity unstable resonator

Funds: Supported by
More Information
  • 摘要:

    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。设计了三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有能量遮挡,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88.2 ns,峰值功率达到26.5 MW。

     

  • 图 1  正分支虚共焦腔原理图

    Figure 1.  Schematic diagram of positive branch confocal unstable resonator

    图 2  实验装置示意图

    Figure 2.  Experimental setup

    图 3  凸镜安装结构示意图。(a)轴向支撑结构;(b)横向支撑结构

    Figure 3.  Schematic diagram of convex mirror installation structures. (a) longitudinal support structure; (b) transverse support structure

    图 4  两种支撑结构下的激光近场能量对比图

    Figure 4.  Near field laser energy under two different supporting structures

    图 5  激光近场光斑照片。(a)轴向支撑结构光斑;(b)横向支撑结构光斑。

    Figure 5.  Near field laser spots for (a) longitudinal support structure; (b) transverse support structure.

    图 6  不同放大倍率下的远场光束发散角

    Figure 6.  Far field divergence angle under different magnifications

    图 7  非稳腔脉宽

    Figure 7.  Pulse width of unstable resonator

    表  1  非稳腔结构参数

    Table  1.   Structural parameters of the unstable resonator

    M R1/ mm R2/ mm D /mm d /mm L/mm
    1.65 10727.5 −6501.5 50 30.2 2113
    1.85 9197.8 −4971.9 50 26.9 2113
    2.25 7606.8 −3380.8 50 22.2 2113
    下载: 导出CSV

    表  2  不同放大率下的理论发散角

    Table  2.   Therotical divergence angles for different M

    M1.651.852.25
    θ/ mrad0.49310.45440.3451
    下载: 导出CSV

    表  3  光束质量因子β数据

    Table  3.   Beam quality factor β data

    Mβ
    transverse supportlongitudinal support
    1.652.052.25
    1.851.982.18
    2.251.832.00
    下载: 导出CSV
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  • 网络出版日期:  2024-05-20

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