Dual comb spectroscopy with tailored spectral broadening in nanophotonic Si3N4

Published

April 15, 2019

Author(s)

Esther Baumann, Edgar Perez, Gabriel M. Colacion, Fabrizio Giorgetta, Kevin Cossel, Gabriel Ycas, David Carlson, Kartik Srinivasan, Scott Papp, Ian Coddington, Nathan R. Newbury

Abstract

Spectral broadening of compact robust Er+: fiber combs is demonstrated with tailored Si3N4 waveguides to obtain spectrally-smooth broadened light in the 2 μm 2.5 μm atmospheric water window for gas spectroscopy. This successfully extends the Er+ spectrum to longer wavelengths not accessible with silica-based fiber systems. To verify the broadband source performance, spectra are acquired with a CO2 and CO gas cell and compared, with excellent agreement, to database line shape models. The dual-comb spectroscopic figure of merit for the new source is 6x106/√Hz, roughly equivalent to that of all-fiber dual comb setups around 1.6 μm. This spectroscopic performance shows that the high coherence between the two combs is retained in the broadening process.

Citation

Optics Express

Pub Type

Journals

Keywords

dual-comb spectroscopy, spectral broadening, SiN waveguides

Citation

Baumann, E. , Perez, E. , Colacion, G. , Giorgetta, F. , Cossel, K. , Ycas, G. , Carlson, D. , Srinivasan, K. , Papp, S. , Coddington, I. and Newbury, N. (2019), Dual comb spectroscopy with tailored spectral broadening in nanophotonic Si3N4, Optics Express (Accessed April 25, 2024)