Abstract

Two Fabry–Perot quantum cascade lasers are used in a differential dual comb configuration to perform rapidly swept dispersion spectroscopy of low-pressure nitrous oxide with $<1\mathrm{ms}$ acquisition time. Active feedback control of the laser injection current enables simultaneous wavelength modulation of both lasers at kilohertz rates. The system demonstrates similar performance in both absorption and dispersion spectroscopy modes and achieves a noise-equivalent absorption figure of merit in the low ${10}^{-4}/\sqrt{\mathrm{Hz}}$ range.

© 2017 Optical Society of America

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