Simple Real Time Trace Nitrogen Dioxide Detector Based on Continuous-Wave Cavity Ringdown Spectroscopy Using Passively Locked External Cavity Diode Laser

被引：6
作者：
Sato, Jun-ichi [1 ]
Nemoto, Kana [1 ]
Yamaguchi, Shigeru [1 ]
Endo, Masamori [1 ]
Nanri, Kenzo [1 ]
Tei, Kazuyoku [1 ]
Fujioka, Tomoo [1 ]
机构：
[1] Tokai Univ, Dept Phys, Sch Sci, Kanagawa 2591292, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2008年 / 47卷 / 08期
关键词：
laser spectroscopy; external cavity; diode laser; cavity ringdown spectroscopy; nitrogen dioxide detection;
D O I：
10.1143/JJAP.47.6478
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on a compact trace nitrogen dioxide (NO) detector based on cavity ringdown spectroscopy (CRDS), using a passively locked external cavity diode laser (PLEC-DL) in the visible wavelength region. Tailoring the spatial mode matching conditions of an antireflection (AR)-coated diode laser with a high finesse external cavity for effective optical feedback into the DL allows for stable resonant enhancement in the external cavity without any electric feedback apparatus. The external cavity having a finesse in excess of 1.4 x 10(5) acts as a ringdown cavity with an effective optical volume (i.e., detection volume) of less than 1 cm(3). We successfully demonstrated a noise equivalent absorption loss of 1.4 x 10(-8)cm(-1), corresponding to a detection limit of 40 ppb NO(2) concentration with a very compact configuration. For differential absorption CRDS, we realized a dual wavelength-locked PLEC-DL in an external cavity simultaneously. Measurements of various NO(2) concentrations in N(2) based on differential absorption CRDS were performed.
引用
收藏
页码：6478 / 6483
页数：6
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