Abstract

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 1.5μm, resulting in a spectrometer that is inexpensive, simple, and robust. It provides a very large spectral bandwidth (1.451.65μm) for investigation of a wide variety of molecular absorptions. Strong molecular absorptions at 1.5μm allow for detection at sensitivities approaching the 1 part in 109 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 2×108cm1Hz12 per detection channel.

© 2007 Optical Society of America

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