Abstract

We demonstrate the precision molecular spectroscopy of ${\mathrm{H}}^{13}\mathrm{CN}$ using a free-running, all-fiber dual electro-optic frequency comb system. Successive interferograms, acquired at a rate of $\mathrm{\Delta }{f}_{\mathrm{rep}}=1\mathrm{MHz}$, were phase-corrected in post-processing, averaged, and normalized to yield the complex transmission spectrum of several transitions within the $2{\nu }_1$ ${\mathrm{H}}^{13}\mathrm{CN}$ band centered near $\lambda =1545\mathrm{nm}$. With spectral signal-to-noise ratios as high as 326:1 achieved in 2 ms of integration time, we report accurate measurements of ${\mathrm{H}}^{13}\mathrm{CN}$ transition intensities which will aid in the study of extreme astrophysical environments.

© 2018 Optical Society of America

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