Rapid measurement of cavity ringdown absorption spectra with a swept-frequency laser

被引：1
|
作者：
Y. He
B.J. Orr
机构：
[1] Macquarie University,Centre for Lasers and Applications
来源：
Applied Physics B | 2004年 / 79卷
关键词：
Laser Frequency; Cavity Length; Free Spectral Range; Memory Depth; Ringdown Time;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A novel cavity ringdown spectrometer, incorporating a miniature continuous-wave swept-frequency laser that is widely tunable, requires less than 1 s to record wide-ranging absorption spectra with high sensitivity in a single rapid sweep of the laser frequency. The free spectral range of the ringdown cavity defines a sampling grid to measure absorbance-dependent ringdown times at successive cavity-resonance frequencies. The spectrometer has a single-ended transmitter-receiver configuration based on retro-reflected optical-heterodyne detection and exploiting fibre-optical telecommunications components. This swept-frequency approach to cavity ringdown spectroscopy yields a simple, low-cost, compact, rugged, versatile instrument for efficient sensing of gases. The performance of the spectrometer is demonstrated by measuring weak near-infrared rovibrational spectra of carbon dioxide gas within the 1.5–1.6 μm wavelength range.
引用
收藏
页码：941 / 945
页数：4
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