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CO2的腔增强吸收与高灵敏吸收光谱研究
引用本文:裴世鑫,高晓明,崔芬萍,黄伟,邵杰,樊宏,张为俊.CO2的腔增强吸收与高灵敏吸收光谱研究[J].光谱学与光谱分析,2005,25(12):1908-1911.
作者姓名:裴世鑫  高晓明  崔芬萍  黄伟  邵杰  樊宏  张为俊
作者单位:中国科学院安徽光学精密机械研究所环境光谱学实验室,安徽,合肥,230031
基金项目:国家高技术研究发展计划(2004AA825100)和安徽省自然科学基金(03045301)资助项目
摘    要:腔增强吸收光谱(CEAS)是在衰荡吸收光谱的基础上发展起来的一种新型的直接吸收光谱技术.文章报道了用中心输出波长为1.573μm的窄线宽连续可调谐半导体激光器(DFB封装)作光源,用两块高反射率平凹透镜(在1.573μm附近,凹面反射率R~99.4%,曲率半径r~1 m)组成对称共焦腔作吸收池的腔增强吸收光谱系统.采用扫描腔长的方法改变谐振腔的模式,当激光器的输出频率与谐振腔的某一腔模之间满足共振匹配关系时,激光被耦合到谐振腔内,用探测器接收透过谐振腔的光信号,同时用波长计精确测量激光器的输出波长.在33.5 cm长的吸收池内测量了吸收强度为1.816×10-23cm-1·(molecule·cm-2)-1的二氧化碳分子的弱吸收谱线,探测灵敏度达到了6.78×10-7 cm-1.实验结果表明,腔增强吸收光谱具有灵敏度高,装置简单,易于操作等优点.

关 键 词:光谱学  腔增强吸收光谱  衰荡吸收光谱  TDL  二氧化碳
文章编号:1000-0593(2005)12-1908-04
收稿时间:2004-09-16
修稿时间:2005-01-30

The Study of CO2 Cavity Enhanced Absorption and Highly Sensitive Absorption Spectroscopy
PEI Shi-xin,GAO Xiao-ming,CUI Fen-ping,HUANG Wei,SHAO Jie,FAN Hong,ZHANG Wei-jun.The Study of CO2 Cavity Enhanced Absorption and Highly Sensitive Absorption Spectroscopy[J].Spectroscopy and Spectral Analysis,2005,25(12):1908-1911.
Authors:PEI Shi-xin  GAO Xiao-ming  CUI Fen-ping  HUANG Wei  SHAO Jie  FAN Hong  ZHANG Wei-jun
Institution:The Environment Spectroscopy Laboratory, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Abstract:Cavity enhanced absorption spectroscopy (CEAS) is a new spectral technology that is based on the cavity ring down absorption spectroscopy. In the present paper, a DFB encapsulation narrow line width tunable diode laser (TDL) was used as the light source. At the center output, the TDL radiation wavelength was 1.573 microm, and an optical cavity, which consisted of two high reflectivity mirrors (near 1.573 microm, the mirror reflectivity was about 0.994%), was used as a sample cell. A wavemeter was used to record the accurate frequency of the laser radiation. In the experiment, the method of scanning the optical cavity to change the cavity mode was used, when the laser frequency was coincident with one of the cavity mode; the laser radiation was coupled into the optical cavity and the detector could receive the light signals that escaped the optical cavity. As a result, the absorption spectrum of carbon dioxide weak absorption at low pressure was obtained with an absorption intensity of 1.816 x 10(-23) cm(-1) x (molecule x cm(-2)(-1) in a sample cell with a length of only 33.5 cm. An absorption sensitivity of about 3.62 x 10(-7) cm(-1) has been achieved. The experiment result indicated that the cavity enhanced absorption spectroscopy has the advantage of high sensivity, simple experimental setup, and easy operation.
Keywords:Spectroscopy  CEAS  CRDS  TDL  CO2
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