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首页> 外文期刊>Applied physics. B, Lasers and optics >Rapid measurement of cavity ringdown absorption spectra with a swept-frequency laser
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Rapid measurement of cavity ringdown absorption spectra with a swept-frequency laser

机译:用扫频激光器快速测量腔振铃吸收光谱

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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.
机译:一种新颖的腔衰荡光谱仪,结合了可广泛调谐的微型连续波扫频激光器,只需不到1 s即可在一次快速扫描激光频率的情况下以高灵敏度记录宽范围的吸收光谱。衰荡腔的自由光谱范围定义了一个采样网格,以在连续的腔共振频率下测量与吸收率相关的衰荡时间。该光谱仪具有基于回射光外差检测并利用光纤电信组件的单端发射机-接收机配置。这种用于腔衰荡光谱的扫频方法产生了一种简单,低成本,紧凑,坚固耐用的多功能仪器,可有效地检测气体。通过测量1.5-1.6μm波长范围内的二氧化碳气体的弱近红外旋转振动光谱来证明光谱仪的性能。

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