Signal line shapes of Fourier transform cavity-enhanced frequency modulation spectroscopy with optical frequency combs
Abstract
We present a thorough analysis of the signal line shapes of Fourier transform-based noise-immune cavity-enhanced optical frequency comb spectroscopy (NICE-OFCS). We discuss the signal dependence on the ratio of the modulation frequency, fm, to the molecular line width, . We compare a full model of the signals and a simplified absorption-like analytical model that has high accuracy for low fm/ ratios and is much faster to compute. We verify the theory experimentally by measuring and fitting NICE-OFCS spectra of CO2 at 1575 nm using a system based on an Er:fiber femtosecond laser and a cavity with a finesse of ~11000.
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