激光器
量子级联激光器
分光计
级联
光学
半导体激光器理论
光电子学
材料科学
探测器
光路
吸收(声学)
半导体
物理
化学
色谱法
作者
David M. Sonnenfroh,Richard T. Wainner,Mark G. Allen,R. K. Varner
出处
期刊:Optical Engineering
[SPIE - International Society for Optical Engineering]
日期:2010-11-01
卷期号:49 (11): 111118-111118
被引量:15
摘要
We demonstrate a mid-IR semiconductor laser-based absorption spectrometer for field measurements of ambient CH4. The field sensor uses a type II quantum cascade laser (or interband cascade laser, ICL) operating near 3.3 µm to monitor a well-isolated line in the 3 fundamental band of CH4. The ICL operates in cw mode at cryogenic temperatures. The sensor uses a multipass cell that provides an optical path of ~7 m with a 0.25-m base path. Thermoelectrically cooled InAs detectors are used along with balanced ratiometric detection to achieve a precision of 15 ppbv for a 60-s integration time. Several successful field demonstrations are carried out at sites maintained by the University of New Hampshire.
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