激光线宽
可调谐激光吸收光谱技术
腔衰荡光谱
激光器
光学腔
吸收(声学)
光谱学
同位素
可调谐激光器
花招
材料科学
二极管
光学
吸收光谱法
共振(粒子物理)
衰减系数
波长
化学
光电子学
法布里-珀罗干涉仪
原子物理学
物理
有机化学
量子力学
分子
作者
S. G. Baran,Gus Hancock,R. Peverall,Grant A. D. Ritchie,Nicola J. van Leeuwen
出处
期刊:Analyst
[Royal Society of Chemistry]
日期:2008-10-22
卷期号:134 (2): 243-249
被引量:46
摘要
An optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) apparatus has been developed, using a distributed feedback diode laser centred close to a wavelength of 1596 nm. Light from a V-shaped optical cavity is allowed to feed back to the laser diode, injection seeding the laser at the cavity mode frequencies, and bringing about linewidth narrowing and frequency locking to the cavity resonance. The OF-CEAS technique's expediency and sensitivity have been demonstrated, first on measurements of aerial water absorptions close to 6260.8 cm(-)(1), and then on two carbon dioxide absorptions close to 6261.7 cm(-)(1) which may be used to measure the concentrations of (13)CO(2) and (12)CO(2) isotopologues in a CO(2) sample. Employing a cavity of moderate finesse (F approximately 3500), an acquisition time-reduced minimum detectable absorption coefficient of 5.8 x 10(-)(9) cm(-)(1) s(1/2) has been determined.
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