High-speed off-axis Cavity Ring-Down Spectroscopy with a re-entrant configuration for spectral resolution enhancement

被引：11
|
作者：
Courtois, Jeremie [1 ]
Mohamed, Ajmal Khan [1 ]
Romanini, Daniele [2 ]
机构：
[1] Off Natl Etud & Rech Aerosp, F-91761 Palaiseau, France
[2] CNRS, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 05期
关键词：
OPTICAL CAVITY; ABSORPTION-SPECTROSCOPY; DIODE-LASER; FINESSE; SPECTROMETER;
D O I：
10.1364/OE.18.004845
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Monitoring of changing samples by Cavity Ring-Down Spectroscopy (CRDS) is possible using fast frequency scans of the laser and/or the cavity resonance. Mode-matched cavity excitation improves performance of fast CRDS but data-points result separated by the cavity Free Spectral Range (FSR): low pressure samples demand long cavities. We demonstrate fast CRDS with off-axis injection of a "re-entrant" resonator yielding FSR/N data-points separation. Our N = 4 short-cavity setup is found to perform well compared with other fast-CRDS implementations. Interestingly, the intrinsic chirped ringing affecting ring-down signals in mode-matched fast-CRDS disappear with off-axis injection. This is due to a fine splitting of the re-entrant-cavity degenerate groups of modes by astigmatism. (C) 2010 Optical Society of America
引用
收藏
页码：4845 / 4858
页数：14
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