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 , resulting in a spectrometer that is inexpensive, simple, and robust. It provides a very large spectral bandwidth for investigation of a wide variety of molecular absorptions. Strong molecular absorptions at allow for detection at sensitivities approaching the 1 part in volume level. We provide a detailed description of our spectrometer and present measurements of the rovibrational spectra for CO, , and with an absorption sensitivity of per detection channel.
© 2007 Optical Society of America
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