Large Signal LD Side-pumped Nd: YAG Laser Amplifier Without Water-cooler

ZOU Ji-yue; LIU Xue-sheng; XU Ai-dong; WANG Cong-cong; YAN An-ru; ZHAO ming; YANG Song; LIU

doi:10.3788/fgxb20194007.0885

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Large Signal LD Side-pumped Nd: YAG Laser Amplifier Without Water-cooler

Device Fabrication and Physics | 更新时间：2020-08-12

- Large Signal LD Side-pumped Nd: YAG Laser Amplifier Without Water-cooler
- Chinese Journal of Luminescence Vol. 40, Issue 7, Pages: 885-890(2019)
- 作者机构：
  
  1. 北京工业大学激光工程研究院, 北京 100124
  2. 江苏北方湖光光电有限公司, 江苏无锡 214035
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20194007.0885
  CLC： TN248.4
- Received：17 July 2018，
  
  Revised：22 October 2018，
  
  Published Online：05 November 2018，
  
  Published：05 July 2019
- 稿件说明：
移动端阅览
邹吉跃, 刘学胜, 徐爱东等. 大信号无水冷LD侧泵Nd∶YAG激光放大器[J]. 发光学报, 2019,40(7): 885-890

ZOU Ji-yue, LIU Xue-sheng, XU Ai-dong etc. Large Signal LD Side-pumped Nd: YAG Laser Amplifier Without Water-cooler[J]. Chinese Journal of Luminescence, 2019,40(7): 885-890
邹吉跃, 刘学胜, 徐爱东等. 大信号无水冷LD侧泵Nd∶YAG激光放大器[J]. 发光学报, 2019,40(7): 885-890 DOI： 10.3788/fgxb20194007.0885.

ZOU Ji-yue, LIU Xue-sheng, XU Ai-dong etc. Large Signal LD Side-pumped Nd: YAG Laser Amplifier Without Water-cooler[J]. Chinese Journal of Luminescence, 2019,40(7): 885-890 DOI： 10.3788/fgxb20194007.0885.

摘要

为了获得高激光脉冲能量，设计了高能脉冲激光放大系统。对该放大系统的输出能量、脉冲宽度、能量稳定度、输出脉冲宽度等进行了研究。首先，进行四能级激光速率方程的分析递推出泵浦能量和储存能量、增益系数等的关系。接着，进行了激光放大器的系统设计，然后进行实验验证，最后，实验还进行了输出激光的性能测试。实验结果表明:在Nd:YAG晶体棒尺寸为

8 mm100 mm、Nd

的掺杂浓度为1.1%、泵浦功率最大24 kW、重复频率为10 Hz、泵浦电流为80 A、泵浦脉宽为200 s的条件下，得到脉冲宽度10 ns、最大脉冲能量1 050 mJ的脉冲激光，输出能量不稳定度

3%，通过刀口法测得水平和垂直方向光束质量

分别是3.9和4.8。满足了高能量、无水冷、稳定可靠等要求。

Abstract

In order to obtain high laser pulse energy

a laser amplifier system was designed. The parameters of the amplifier system are studied such as the output energy

pulse width

energy stability and output pulse width. First

the analysis of the four-level laser rate equation is carried out

and the relations between pump energy

storage energy

and gain coefficient are derived. Then

the system design of the laser amplifier is given

and the experimental verification is carried out. Finally

the performance index of the output laser is tested. Experimental results indicate that

at the size of the Nd:YAG crystal rod of

8 mm100 mm

the doping concentration Nd

of 1.1%

the pump maximum power of 24 kW

the semiconductor thermoelectric refrigeration with three maximum power of 66 W

the repetition frequency of 10 Hz

the pump current of 80 A

the pump pulse width of 200 s

we obtained the output of the laser with the maximum pulse energy of 1 050 mJ at a wavelength of 1 064 nm

a pulse width of 10 ns and an output energy instability of 3%. The beam qualities

horizontal and vertical directions are 3.9 and 4.8

respectively

through the beam quality diagnostic instrument M-200S. It can satisfy the system requirements of high energy

without water-cooling

stability and reliability.

关键词

Keywords

references

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