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纳秒级激光脉冲展宽系统的分析及应用

Analysis and application of nanosecond laser pulse stretching system

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摘要

建立了一种纳秒级多腔式激光脉冲扩展系统。通过激光脉冲展宽,该系统可以有效降低脉冲激光的峰值功率,从而在激光燃烧诊断实验中避免激光诱导等离子体的产生,减少背景干扰,有效提高信噪比。建立了理论模型,对影响脉冲展宽的分束比、腔长以及光学腔个数等几个主要参数进行了分析,并通过数值计算实现了各参数的优化。利用建立的多腔串联式激光脉冲展宽器,对Nd∶YAG脉冲激光器二倍频激光进行了脉冲展宽,将脉宽为7.8 ns的脉冲激光分别展宽为17,35和72 ns,激光的峰值功率最大可降低为原激光峰值功率的9%左右,并保持了较好的光束质量。将该展宽器应用于自发喇曼散射实验中,很好地解决了激光诱导击穿光谱对喇曼信号的干扰,取得了较好的实验结果。

Abstract

A multi-cavity passive nanosecond laser pulse stretching system was designed. The system could reduce laser peak powers and avoid the laser induced plasma spark, so that it reduces background interference and improves the signal to noise ratio in combustion diagnostics. The theoretical model of the pulse-stretching process for an arbitrary number of optical ring cavities was introduced,and several key parameters that affect on pulse width, beam-splitter reflectivity, cavity length and total number of optical cavities were analyzed. Finally,the designed multi-cavity laser pulse stretcher was used in broadening the Nd:YAG laser harmonic pulse width.Results indicate that a 7.8 ns input laser pulse has been converted into approximately the output laser pulses in 17 ns, 35 ns and 72 ns, respectively.Furthermore, the laser peak power has been reduced to 9% of the original laser peak power, meanwhile,it maintains the good beam quality. The stretcher was also used in the spontaneous Raman scattering experiments, and results show it well resolves the laser induced breakdown spectroscopy of the Raman signal and achieves good results.

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中图分类号:TN248.1

所属栏目:现代应用光学

基金项目:激光与物质相互作用国家重点实验室基金资助项目(No.SKL110905)

收稿日期:2010-10-08

修改稿日期:2010-10-30

网络出版日期:0001-01-01

作者单位    点击查看

张振荣: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
胡志云: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
黄梅生: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
叶景峰: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
刘晶儒: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

联系人作者:张振荣(nintzzr@163.com)

备注:张振荣(1974-),男,陕西蒲城人,副研究员,1997年于西北工业大学获得学士学位,2004年于西北核技术研究所获得硕士学位,主要从事激光技术及应用方面的研究。

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【2】GITTINS C M, SHENOY S U, ALDAG H R. Measurements of major species in a high pressure gas turbise combustion simulator using Raman scattering[R]. AIAA,2000-0772.

【3】KOJIMA J, NGUYENL Q V. Spontaneous Raman scattering diagnostics for high-pressure gaseous flames[R]. AIAA, 2002-3041.

【4】CHEHROUDI B, COHN R, TALLEY D, et al.. Raman scattering measurements in the initial region of sub- and supercritical jets[R]. AIAA,2000-3392.

【5】CHEN Y L, LEWIS J W L. Visualization of laser-induced breakdown and ignition[J]. Opt Exp, 2001,9:360-372.

【6】HARIGEL G, BALTAY C, BREGMAN M, et al.. Pulse stretching in a Q-switched ruby laser for bubble chamber holography[J]. Appl Opt, 1986,25:4102-4110.

【7】KOJIMA J, NGUYEN Q V. Laser pulse-stretching with multiple optical ring cavities[J]. Appl Opt, 2002,41(30):6360-6370.

【8】王双义,吕志伟,林殿阳,等. KrF激光脉冲整形研究[J]. 强激光与粒子束,2005,17(11):1669-1673.
WANG SH Y, LU ZH W, LIN D Y, et al.. KrF laser pulse shaping by pulse stacking[J]. High Power Laser and Particle Beams, 2005,17(11):1669-1673. (in Chinese)

【9】纪帆,随展,李锋,等. 时域延时多脉冲叠加平滑过程的分析[J]. 强激光与粒子束,2006,18(3):1669-1673.
JI F, SUI ZH, LI F, et al.. Analysis of pulse smoothing by multi-pulse interference in time domain [J]. High Power Laser and Particle Beams, 2006,18(3):1669-1673. (in Chinese)

引用该论文

ZHANG Zhen-rong,HU Zhi-yun,HUANG Mei-sheng,E Jing-feng,LIU Jing-ru. Analysis and application of nanosecond laser pulse stretching system[J]. Optics and Precision Engineering, 2011, 19(2): 310-315

张振荣,胡志云,黄梅生,叶景峰,刘晶儒. 纳秒级激光脉冲展宽系统的分析及应用[J]. 光学 精密工程, 2011, 19(2): 310-315

被引情况

【1】张振荣,朱峰,李国华,瞿谱波,黄超,沈炎龙,胡志云. 基于XeF(C-A)激光激励的自发拉曼散射技术研究. 光学学报, 2014, 34(11): 1114001--1

【2】李殿军,王化龙,杨贵龙,李世明,于洪君. 峰值功率等激光术语的理解与应用问题. 中国光学, 2015, 8(5): 873-880

【3】陈 圳,任海兰. MOPA结构脉冲光纤激光器输出特性的实验研究. 光通信研究, 2018, 44(3): 52-54

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