Abstract
We present a spectrometer based on the cavity enhanced amplitude modulated laser absorption spectroscopy (CEAMLAS) technique for measuring molecular gas absorption. This CEAMLAS spectrometer accurately measured a CO2 absorption line at 1572.992nm with effectively 100% measurement duty cycle. It achieved an absorption sensitivity of 5.2×10-9Hz-1/2 using a linear Fabry-Perot cavity with a modest finesse of 1000. We also used the spectrometer to perform preliminary measurements of the 13C/ 12C isotopic ratio in CO2, yielding an isotopic signature δ13C of -83±9‰ for our CO2 sample.
Original language | English |
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Article number | 053505 |
Journal | Applied Physics Letters |
Volume | 105 |
Issue number | 5 |
DOIs | |
Publication status | Published - 4 Aug 2014 |