首页 | 本学科首页   官方微博 | 高级检索  
     检索      

高灵敏度离轴积分腔输出光谱技术
引用本文:赵卫雄,高晓明,张为俊,黄腾.高灵敏度离轴积分腔输出光谱技术[J].光学学报,2006,26(8):260-1264.
作者姓名:赵卫雄  高晓明  张为俊  黄腾
作者单位:中国科学院安徽光学精密机械研究所,合肥,230031
摘    要:利用离轴积分腔输出光谱技术,采用同时扫描激光和谐振腔腔长的方法,使用分布反馈布拉格二极管激光器探测了1.573μm附近CO2的吸收光谱,得到很好的信噪比和灵敏度,探测灵敏度达到4×10-8cm-1(信噪比为2,1 s积分时间)。用非线性最小二乘拟合吸收谱线方法对积分腔输出光谱已经不再适用,会造成自加宽系数变宽为实际自加宽系数的2.39倍左右,对空气加宽系数测量影响较小。为了得到正确的谱线线宽参量,应该对吸收系数进行拟合,该结论从理论和实验上得到了证明。

关 键 词:光谱学  积分腔输出光谱技术  离轴入射  朗伯比尔定律  谱线拟合  吸收系数
文章编号:0253-2239(2006)08-1260-5
收稿时间:2005-08-17
修稿时间:2005-10-27

High-Sensitivity off-Axis Integrated Cavity Output Spectroscopy
Zhao Weixiong,Gao Xiaoming,Zhang Weijun,Huang Teng.High-Sensitivity off-Axis Integrated Cavity Output Spectroscopy[J].Acta Optica Sinica,2006,26(8):260-1264.
Authors:Zhao Weixiong  Gao Xiaoming  Zhang Weijun  Huang Teng
Abstract:Using a distributed feed back (DFB) tunable diode laser as the injection light source, absorption spectrum around 1.573 μm with high signal-to-noise ratio (SNR) and sensitivity is obtained by using off-axis integrated cavity output spectroscopy and scanning the laser and cavity simultaneously. The typical sensitivity is 4×10-8 cm-1 (SNR=2,1s integrated time). It is not valid to fit the integrated cavity output spectrum with the nonlinear least square method, and it will make the self-broadening coefficient broadened as about 2.39 times of the real value. The air-broaden coefficient approaches to the real one. Absorption coefficient fit is necessary to obtain the correct parametersof spectral line width. Theoretical analysis and experiment demonstration prove the conclusion.
Keywords:spectroscopy  integrated cavity output spectroscopy (ICOS)  off-axis incidence  Lambert-Beer's law  line shape fitting  absorption coefficient
本文献已被 CNKI 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号