Wavelength modulation spectroscopy based on quasi-continuous-wave diode lasers  

作　　者：齐汝宾 杜振辉 高东宇 李金义 徐可欣 

机构地区：[1]State Key Laboratory of Precision Measuring Technology and Instruments,Tianjin University

出　　处：《Chinese Optics Letters》2012年第3期77-79,共3页中国光学快报（英文版）

基　　金：supported by the National "863" Program of China(No.2006AA06Z410);the Natural Science Foundation of Tianjin(No.06YFJMJC06700);the Exploratory Self-Selection Subject of State Key Laboratoryof Precision Measuring Technology and Instruments(No.PILT1107)

摘　　要：A modified wavelength modulation spectroscopy（WMS）based on the self-heating effect of the tunable diode laser when driven in quasi-continuous-wave（QCW）mode is investigated.A near-infrared distributed feedback（DFB）diode laser working at the QCW mode is employed as the QCW light source,and CO2 is selected as the target gas.The characteristic of the QCW second harmonic（2f）line profile is analyzed through a comparison with that of the traditional CW WMS with the same system.A noise-equivalent absorbance of 3.2×10-5 Hz-1/2 for CO2 at 1.58μm is obtained with 18-m optical path.The QCW WMS lowers the dependence on lasers and expands selectivity,thus verifying the feasibility of the method.A modified wavelength modulation spectroscopy（WMS）based on the self-heating effect of the tunable diode laser when driven in quasi-continuous-wave（QCW）mode is investigated.A near-infrared distributed feedback（DFB）diode laser working at the QCW mode is employed as the QCW light source,and CO2 is selected as the target gas.The characteristic of the QCW second harmonic（2f）line profile is analyzed through a comparison with that of the traditional CW WMS with the same system.A noise-equivalent absorbance of 3.2×10-5 Hz-1/2 for CO2 at 1.58μm is obtained with 18-m optical path.The QCW WMS lowers the dependence on lasers and expands selectivity,thus verifying the feasibility of the method.

关 键 词：Carbon dioxide Light sources Molecular spectroscopy 

分 类 号：TN248.4[电子电信—物理电子学]