Hundred-Hertz nonchain HF laser with long operation period based on initiated discharge

Chao HUANG; Ke HUANG; Lian-ying MA; Feng ZHU; Ai-ping YI

doi:10.3788/OPE.20192705.1060

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Hundred-Hertz nonchain HF laser with long operation period based on initiated discharge

Modern Applied Optics | 更新时间：2020-08-13

- Hundred-Hertz nonchain HF laser with long operation period based on initiated discharge
- Optics and Precision Engineering Vol. 27, Issue 5, Pages: 1060-1068(2019)
- 作者机构：
  
  西北核技术研究所激光与物质相互作用国家重点实验室，陕西西安 710024
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192705.1060
  CLC： TP245
- Received：05 December 2018，
  
  Accepted：21 January 2019，
  
  Published：15 May 2019
- 稿件说明：
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Chao HUANG, Ke HUANG, Lian-ying MA, et al. Hundred-Hertz nonchain HF laser with long operation period based on initiated discharge[J]. Optics and precision engineering, 2019, 27(5): 1060-1068.
DOI：

Chao HUANG, Ke HUANG, Lian-ying MA, et al. Hundred-Hertz nonchain HF laser with long operation period based on initiated discharge[J]. Optics and precision engineering, 2019, 27(5): 1060-1068. DOI： 10.3788/OPE.20192705.1060.

摘要

为了获得稳定的、大能量重频中红外HF激光输出，基于紧凑型、闭环放电引发非链式HF中红外化学激光器，从能量影响因素、解决措施和实验验证三个方面系统性地研究了100 Hz重频HF激光的能量稳定性。首先结合非链式HF化学激光动力学过程和静态重频实验，分析发现了影响重频放电引发非链式HF化学激光器脉冲能量稳定性的三个主要因素，包括均匀体放电难以维持、基态HF分子强的消激发效应和工作气体的持续消耗。然后利用工作气体循环流动置换增益区气体，当增益区气体流速为9 m/s时激光器100 Hz重频运行的放电状态维持良好，获得100 Hz/ 55 W的激光输出。最后，采用分子筛吸附分离基态HF分子纯净工作气体以及实时补给工作气体，提升了重频HF激光器长时间运行的能量稳定性。实验结果表明：100 Hz重频放电引发非链式HF激光器获得了30 s的长时间稳定输出，激光能量下降率可优于10%。综合工作气体循环流动、分子筛吸附基态HF分子和工作气体实时补给，放电引发非链式HF激光器实现了高重频长时间的稳定输出。

Abstract

The aim of this investigation was to achieve stable and high-energy repetitive pulsed mid-infrared HF laser operation. A systemic study of pulsed energy stability based on a compact

closed-circle

electric-discharge nonchain HF chemical laser with a repetition frequency of 100 Hz was performed. Initially

the three main factors that influence pulse energy stability in an electric-discharge nonchain HF chemical laser were identified based on chemical reaction kinetics and experimental results without gas flow. In part

the experiments involved the nonmaintenance of uniform volume discharge and the intense de-excitation effect of excited HF molecules via collision deactivation with ground state HF molecules

in addition to the consumption of the working gas. Then

using circular flow

the working gas in the gain region was replaced. Moreover

by maintaining a uniform volume discharge

a 100 Hz repetition-rate HF laser was realized when the gas flow rate in the gain region was 9 m/s. This resulted in an average laser power of approximately 55 W at this repetition rate. Finally

the pulse energy stability of the laser was notably improved when the molecular sieve only absorbed ground-state HF molecule to purify the working gas

which is replenished in real-time. The experimental results show that the pulse energy stability of the HF laser was feasible for operation periods of 30 s

and the average decrease in energy is less than 10%. It is possible to operate for longer periods at a high repetition rate with little loss of the average energy via a combination of recirculation gas flow

selective removal of the ground state HF molecules using a molecular sieve

and by allowing a small replenishment of the working gas.

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