100 kHz高功率高光束质量纳秒激光振荡器

杨天利; 杨晶; 周王哲; 李雪鹏; 王小军; 彭钦军

doi:10.11884/HPLPB202335.230023

100 kHz高功率高光束质量纳秒激光振荡器

doi: 10.11884/HPLPB202335.230023

杨天利^{1, 2, 3,},
杨晶^{1, 2, 4, ,},
周王哲^{1, 2, 3},
李雪鹏^{1, 2, 4},
王小军^{1, 2, 4, ,},
彭钦军^{1, 2, 4}

1.
中国科学院理化技术研究所固体激光重点实验室，北京 100190
2.
中国科学院理化技术研究所功能晶体与激光技术重点实验室，北京 100190
3.
中国科学院大学，北京 100049
4.
齐鲁中科光物理与工程技术研究院，济南 250000

详细信息

作者简介:
杨天利，yangtianli18@mails.ucas.ac.cn

通讯作者:
杨　晶， yangjing@mail.ipc.ac.cn

王小军， wangxj@mail.ipc.ac.cn

中图分类号: TN248.1
计量
- 文章访问数: 387
- HTML全文浏览量: 116
- PDF下载量: 102
- 被引次数: 0
出版历程
- 收稿日期: 2023-02-13
- 修回日期: 2023-05-09
- 录用日期: 2023-04-27
- 网络出版日期: 2023-05-16
- 刊出日期: 2023-06-15

100 kHz high power high beam quality nanosecond laser oscillator

Yang Tianli^{1, 2, 3
,},
Yang Jing^{1, 2, 4
, ,},
Zhou Wangzhe^{1, 2, 3},
Li Xuepeng^{1, 2, 4},
Wang Xiaojun^{1, 2, 4
, ,},
Peng Qinjun^{1, 2, 4}

1.
Key Laboratory of Solid State Laser, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2.
Key Laboratory of Function Crystal and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
3.
University of Chinese Academy of Sciences, Beijing 100190, China
4.
Institute of Optical Physics and Engineering Technology, Qilu Zhongke, Ji’nan 250000, China

摘要

摘要: 高功率、高重复频率纳秒脉冲激光广泛应用于激光切割、激光焊接等领域。随着激光重复频率的提升，特别是高于50 kHz时，单个周期有限的时间内难以积累足够的上能级粒子，调Q脉冲的稳定性成为了激光器设计的难点。当前主要采用主振荡器的功率放大器（MOPA）方案，直接振荡获得兼具高功率、高重复频率及高光束质量的纳秒脉冲激光还比较困难。通过对激光动力学过程的仿真模拟，定量分析了高重复频率调Q过程中脉冲强度稳定性与泵浦速率的关系，并利用负透镜使振荡器工作在具有较大基模体积的热近非稳区，实现了Nd:YAG声光调Q激光振荡器在高重复频率、高功率、高光束质量三方面的均衡设计。首次利用侧泵模块实现了100 kHz高功率高光束质量纳秒脉冲激光的直接振荡产生，脉冲强度的离散系数仅为0.041，激光输出功率超过142 W，脉冲宽度为165 ns，光束质量因子M²为1.5。
- 激光振荡器 /
- 高重复频率 /
- 声光调Q /
- 纳秒 /
- 高光束质量
Abstract: Nanosecond (ns) pulsed laser with high average power and high repetition rate is a potential solution for laser cutting, laser welding and many other processing applications. With the increase of pulse repetition rate, especially when it is higher than 50 kHz, it is difficult to accumulate enough upper state population in a limited time, and the stability of laser pulse becomes a challenge in the design of laser. The main oscillator power amplifier (MOPA) system is the main method currently used. It is difficult to obtain ns pulsed laser with high average power, high repetition rate and high beam quality through direct oscillation. In this paper, the quantitative relationship between the intensity stability of laser pulse and the pump rate is analyzed according to the simulation of high repetition rate Q-switched laser. Combined with the use of plane-concave lenses to make the cavity a thermal-near-unstable cavity with a large-volume fundamental mode, the balanced design of Nd:YAG acousto-optic (AO) Q-switched laser oscillator with high repetition rate, high power and high beam quality was realized. A direct oscillation of 100 kHz high power high beam quality ns pulsed laser by using side pumped module was realized for the first time, the discrete coefficient of pulse intensity was only 0.041, the output power exceeded 142 W, the pulse width was 165 ns, and the beam quality factor M² was 1.5.
- laser oscillator /
- high repetition rate /
- acousto-optic Q-switched /
- nanosecond /
- high beam quality

HTML全文

图 1 LD侧泵Nd:YAG模块横截面示意图

Figure 1. Cross section of LD side-pumped Nd:YAG module

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图 2 单个LD侧泵Nd:YAG模块的热透镜焦距与泵浦功率的关系

Figure 2. Thermal lens focal length versus the pump power for a single LD side-pumped Nd:YAG module

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图 3 LD侧泵Nd:YAG调Q激光振荡器示意图

Figure 3. Schematic of the Q-switched LD side-pumped Nd:YAG oscillator

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图 4 基模光斑直径与热焦距的关系

Figure 4. Diameter of the fundamental mode versus the thermal focal length

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图 5 泵浦速率与调Q脉冲强度的离散系数 $ V_{\rm{s}} $ 的关系的激光动力学仿真模拟结果

Figure 5. Laser dynamic simulation results of the discrete coefficient $ V_{\rm{s}} $ versus the pump rate

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图 6 优化后输出功率随泵浦功率变化曲线

Figure 6. Average output power versus pump power after optimization

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图 7 泵浦功率为669 W和629.5 W时脉冲序列的典型实验测量（蓝色）与数值计算（红色）结果

Figure 7. Typical experimental measurement (blue) and numerical calculation (red) results of pulse train at pump powers of 669 W and 629.5 W

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图 8 优化后的M²测量结果，插图为远场光斑

Figure 8. M² measurement result after optimization. Inset is the beam far-filed intensity profile

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