Direct and wavelength modulation spectroscopy using a cw external cavity quantum cascade laser

被引：58
作者：
Hancock, G. [1 ]
van Helden, J. H. [1 ]
Peverall, R. [1 ]
Ritchie, G. A. D. [1 ]
Walker, R. J. [1 ]
机构：
[1] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 20期
基金：
英国工程与自然科学研究理事会;
关键词：
modulation spectroscopy; quantum cascade lasers; CONTINUOUS-WAVE OPERATION; ROOM-TEMPERATURE; ABSORPTION;
D O I：
10.1063/1.3141521
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A continuous wave external cavity quantum cascade laser (EC-QCL) operating between 1872 and 1958 cm(-1) has been used to make rotationally resolved measurements in the fundamental band of nitric oxide at 140 mTorr, and the nu(2) band of water at atmospheric pressure. These measurements demonstrate the advantages of wide tunability and high resolution of the EC-QCL system. From direct absorption spectroscopy on nitric oxide a laser bandwidth of 20 MHz has been deduced and a sensitivity of 8.4x10(-4) cm(-1) Hz(-1/2) was achieved. Wavelength modulation spectroscopy using current modulation enhances the sensitivity by a factor of 23 to 3.7x10(-5) cm(-1) Hz(-1/2).
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页数：3
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