Cavity-ringdown molecular spectroscopy based on an optical frequency comb at 1.45-1.65 microm

Optical frequency comb-based cavity-ringdown spectroscopy has recently enabled high-sensitivity absorption detection of molecules over a broad spectral range. We demonstrate an improved system based on a mode-locked erbium-doped fiber laser source centered at 1.5 microm, resulting in a spectrometer...

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Bibliographic Details
Published in:Optics letters 2007-02, Vol.32 (3), p.307-309
Main Authors: Thorpe, Michael J, Hudson, Darren D, Moll, Kevin D, Lasri, Jacob, Ye, Jun
Format: Article
Language:English
Online Access:Get full text
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Summary:Optical frequency comb-based cavity-ringdown spectroscopy has recently enabled high-sensitivity absorption detection of molecules over a broad spectral range. We demonstrate an improved system based on a mode-locked erbium-doped fiber laser source centered at 1.5 microm, resulting in a spectrometer that is inexpensive, simple, and robust. It provides a very large spectral bandwidth (1.45-1.65 microm) for investigation of a wide variety of molecular absorptions. Strong molecular absorptions at 1.5 mum allow for detection at sensitivities approaching the 1 part in 10(9) volume level. We provide a detailed description of our spectrometer and present measurements of the rovibrational spectra for CO, NH3, and C2H2 with an absorption sensitivity of 2 x 10(-8) cm(-1)Hz(-1/2) per detection channel.
ISSN:0146-9592