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Dual frequency comb spectroscopy with a single laser

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Abstract

We demonstrate a simple scheme for dual frequency comb spectroscopy in which the second frequency comb is generated by propagating the primary pulse train through a dazzler. The two frequency combs are combined behind a Mach–Zehnder interferometer, and the optical spectrum is read out by an rf-spectrum analyzer. The method is applied to record the overtone absorption spectrum of C2H2 (acetylene) in the wavelength region around 1.03 μm. A spectrum with a resolution of 4cm1 is obtained, which compares well with that from the HITRAN database. A simple method for improving the spectral resolution is demonstrated.

© 2014 Optical Society of America

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