气体自发拉曼系统激光脉冲外整形光路

›› 2012, Vol. ›› Issue (06): 1453-1458.

气体自发拉曼系统激光脉冲外整形光路

程鹏¹, 王伟东², 李晓冰³, 蒋俊光², 池俊成⁴, 郭英男¹

1. 吉林大学汽车仿真与控制国家重点实验室, 长春130022;
2. 中国科学研究院长春应用化学研究所, 长春130011;
3. 长春奥普光电技术股份有限公司, 长春130031;
4. 中国人民解放军装甲兵技术学院车辆工程系, 长春 130052

收稿日期:2011-10-20 出版日期:2012-11-01
通讯作者: 郭英男(1946-),男,教授,博士生导师.研究方向:内燃机工作过程优化与控制.E-mail:guoyn@jlu.edu.cn E-mail:guoyn@jlu.edu.cn
基金资助:
吉林省科技发展计划项目(20090566).

Laser pulse beam external reshaping optical path used by gas spontaneous Raman spectrum excited system

CHENG Peng¹, WANG Wei-dong², LI Xiao-bing³, JIANG Jun-guang², CHI Jun-cheng⁴, GUO Ying-nan¹

1. State Key Laboratory of Automobile Simulation and Control, Jilin University, Changchun 130022, China;
2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130011, China;
3. Changchun UP Optotech Co. Ltd., Changchun 130031, China;
4. College of Automotive Engineering, Academy of Armored Force Technology of PLA, Changchun 130052, China

Received:2011-10-20 Online:2012-11-01

摘要/Abstract

摘要： 设计了一种多级光学环腔串联的激光脉冲外整形光路。在气体自发拉曼散射激发系统中,有效地避免了在强激光脉冲功率密度条件下所造成的气体裂解、石英玻璃窗口损坏及可燃气体点燃等现象的发生,可大幅度提高弱的气体拉曼信号的信噪比。通过数值模拟优化设计,第一腔的延迟时间为原始激光的脉宽半高宽(FWHM),各腔间的延迟时间比是2的倍数,分束镜的分束比为30%~50%。使用两个光学环腔,可以将脉宽为6.5 ns、能量为400 mJ原激光展宽整形到35 ns,激光峰值功率降低了20%左右,并小于0.02 GW。在混合气体样池中完成了基于激光拉曼光谱定量的浓度测量。该技术可进一步应用在光学发动机中混合气浓度和温度场的定量测定。

关键词: 动力机械工程, 自发拉曼光谱, Nd:YAG激光器, 激光脉冲整形

Abstract: A nanosecond-long laser pulse beam external reshaping optical path was designed using a series of multiple optical ring-cavities. In gas laser spontaneous Raman scattering experiments, it avoids effectively the strong laser induced gas dissociation, optical quertz window components damage and the ignition of the flammable gas, so improves substantially the signal-to-noise ratio of the weak signal generated by the Raman effect. The results of numerical study and optimization design showed that the delay time of the cavity 1 equals to the full-width-half-maximum(FWHM) of the original laser beam, and the ratios between the delay times of the subsequent cavities should be the nultiples of 2, the splitting ratio of the beam splitter is 30%~50%. Using 2 optical ring-cavities, the original laser beam with pulse width(FWHM) 6.5 ns, energy 400 mJ was widened to 35 ns(FWHM) with a peak power reduction of 20% to less than 0.02 GW. The concentration measurements were performed in the gas mixture pool based on the quantification by the laser Raman spectrum.This technique can be further used in the quantitative measurement of gas mixture concentration and temperature field of the optical engine.

Key words: power machinery and engineering, spontaneous Raman spectrum, Nd:YAG laser, laser beam pulse reshaping

中图分类号:

TK314

程鹏, 王伟东, 李晓冰, 蒋俊光, 池俊成, 郭英男. 气体自发拉曼系统激光脉冲外整形光路[J]. , 2012, (06): 1453-1458.

CHENG Peng, WANG Wei-dong, LI Xiao-bing, JIANG Jun-guang, CHI Jun-cheng, GUO Ying-nan. Laser pulse beam external reshaping optical path used by gas spontaneous Raman spectrum excited system[J]. , 2012, (06): 1453-1458.

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