Abstract

We present a new approach to cavity enhanced-direct frequency comb spectroscopy where the full emission bandwidth of a titanium:sapphire laser is exploited, currently at gigahertz resolution. The technique is based on low-resolution Vernier filtering obtained with an appreciable actively stabilized mismatch between the cavity-free spectral range and the laser repetition rate, using a diffraction grating and a split-photodiode. Spectra covering $1300{\mathrm{cm}}^{-1}$ (40 THz) are acquired in less than 100 ms, and a baseline noise of $1.7\times {10}^{-8}{\mathrm{cm}}^{-1}$ is reached with a cavity finesse of only 300, providing an absorption figure of merit $M=6\times {10}^{-11}{\mathrm{cm}}^{-1}·{\mathrm{Hz}}^{-1/2}$.

© 2014 Optical Society of America

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