Wavelength modulation spectroscopy:: combined frequency and intensity laser modulation

被引：252
|
作者：
Schilt, S [1 ]
Thévenaz, L [1 ]
Robert, P [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Lab Metrol & Photon, CH-1015 Lausanne, Switzerland
来源：
APPLIED OPTICS | 2003年 / 42卷 / 33期
关键词：
D O I：
10.1364/AO.42.006728
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a Lorentzian absorption line is presented. This theory describes the general case of a current-modulated semiconductor laser, for which a combined intensity and frequency modulation with an arbitrary phase shift occurs. On the basis of this model, the effect of several modulation parameters on the detected signals is evaluated. Experimental signals measured on an absorption line of CO2 by use of a 2-mum distributed-feedback laser are also presented and validate this analysis. These experimental results agree with the calculated signals, confirming the relevance of the model. (C) 2003 Optical Society of America.
引用
收藏
页码：6728 / 6738
页数：11
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