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 1300cm1 (40 THz) are acquired in less than 100 ms, and a baseline noise of 1.7×108cm1 is reached with a cavity finesse of only 300, providing an absorption figure of merit M=6×1011cm1·Hz1/2.

© 2014 Optical Society of America

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