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

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

阮鹏^1, ,,
汪玉海¹,
潘其坤²,
邵春雷²,
陈飞²,
郭劲²

1.
吉林师范大学信息技术学院, 吉林四平 136000
2.
中国科学院长春光学精密机械与物理研究所, 吉林长春 130033

基金项目: 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）

详细信息

作者简介:
阮　鹏（1985—），女，湖北宜昌人，博士，讲师，硕士生导师，2009年于东北林业大学获得学士学位，2014年于中国科学院长春光学精密机械与物理研究所获得博士学位。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
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出版历程
- 收稿日期: 2023-11-24
- 修回日期: 2024-01-09
- 网络出版日期: 2024-05-20

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

1.
College of Information Technology, Jilin Normal University, Siping 136000, China
2.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033, China

Funds: Supported by the Natural Science Foundation of Jilin Province (No. 20220101207JC); State Key Laboratory of Laser Interaction with Matter Project (No. SKLLIM2115)

More Information

Corresponding author: eagle_laser@163.com

摘要

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θ_0.865=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。
- DF激光器 /
- 内腔式 /
- 虚共焦非稳腔 /
- 光束质量
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 deuterium fluoride (DF) lasers. Three sets of positive branch virtual confocal unstable resonators with different magnifications 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 support 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 θ_0.865 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.
- DF laser /
- inner cavity /
- positive branch confocal unstable resonator /
- beam quality

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图 1 正分支虚共焦非稳腔原理图

Figure 1. Schematic diagram of positive branch virtual confocal unstable resonator

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图 2 实验装置示意图

Figure 2. Schematic diagram of experimental setup

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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 structure. (a) Longitudinal support structure; (b) transverse support structure

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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 types of supporting structures

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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 and (b) transverse support structure

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图 6 不同放大倍率下的远场光束发散角

Figure 6. Far field divergence angles under different magnifications

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图 7 非稳腔脉宽

Figure 7. Pulse width of unstable resonator

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表 1 3种不同放大率的正分支非虚共焦非稳腔结构参数

Table 1. Structural parameters of three sets of positive branch virtual confocal unstable resonator with different magnifications

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

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表 2 不同放大率下的理论发散角

Table 2. Theoretical divergence angles for different M

M 1.65 1.85 2.25

θ/ mrad 0.4931 0.4544 0.3451

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表 3 不同放大倍率下光束质量因子β数据

Table 3. Beam quality factor β data

M β

Transverse support Longitudinal support

1.65 2.05 2.25

1.85 1.98 2.18

2.25 1.83 2.00

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