3 years ago

# Dual-comb spectroscopy with tailored spectral broadening in Si$_3$N$_4$ nanophotonics.

Esther Baumann, Eli V. Hoenig, Edgar F. Perez, Gabriel M. Colacion, Fabrizio R. Giorgetta, Kevin C. Cossel, Gabriel Ycas, David R. Carlson, Daniel D. Hickstein, Kartik Srinivasan, Scott B. Papp, Nathan R. Newbury, Ian Coddington

Si$_3$N$_4$ waveguides, pumped at 1550 nm, can provide spectrally smooth, broadband light for gas spectroscopy in the important 2 ${\mathrm{\mu}}$m to 2.5 ${\mathrm{\mu}}$m atmospheric water window, which is only partially accessible with silica-fiber based systems. By combining Er+:fiber frequency combs and supercontinuum generation in tailored Si$_3$N$_4$ waveguides, high signal-to-noise dual-comb spectroscopy (DCS) spanning 2 ${\mathrm{\mu}}$m to 2.5 ${\mathrm{\mu}}$m is demonstrated. Acquired broadband dual-comb spectra of CO and CO$_2$ agree well with database line shape models and have a spectral-signal-to-noise as high as 48$/\sqrt{\mathrm{s}}$, showing that the high coherence between the two combs is retained in the Si$_3$N$_4$ supercontinuum generation. The DCS figure of merit is 6$\times 10^6/\sqrt{\mathrm{s}}$, equivalent to that of all-fiber DCS systems in the 1.6 ${\mathrm{\mu}}$m band. Based on these results, future DCS can combine fiber comb technology with Si$_3$N$_4$ waveguides to access new spectral windows in a robust non-laboratory platform.

Publisher URL: http://arxiv.org/abs/1811.05906

DOI: arXiv:1811.05906v1

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