کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5427400 | 1508628 | 2017 | 11 صفحه PDF | دانلود رایگان |
- A recently introduced Cavity-Enhanced Direct-Frequency-Comb Spectroscopy technique is discussed in detail.
- It relies on the continuous-Vernier-filtering regime, defined in this paper.
- Spectra with high sensitivity covering 2000cmâ1 at 2Â GHz resolution are obtained.
- A complete formalism is presented to adjust spectra at atmospheric conditions.
We have recently introduced the Vernier-based Direct Frequency Comb Cavity-Enhanced Spectroscopy technique which allows us to record broadband spectra at high sensitivity and GHz resolution (Rutkowski and Morville, 2014) [1]. We discuss here the effect of Vernier filtering on the observed lineshapes in the 3ν+δ band of water vapor and the entire A-band of oxygen around 800 nm in ambient air. We derive expressions for the absorption profiles resulting from the continuous Vernier filtering method, testing them on spectra covering more than 2000 cmâ1 around 12,500 cmâ1. With 31,300 independent spectral elements acquired at the second time scale, an absorption baseline noise of 2Ã10â8cmâ1 is obtained, providing a figure of merit of 1.1Ã10â10 cmâ1/Hz per spectral element with a cavity finesse of 3000 and a cavity round-trip length around 3.3 m.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 187, January 2017, Pages 204-214