High-resolution and gapless dual comb spectroscopy with current-tuned quantum cascade lasers
Applied Physics
2020-04-22 v3 Optics
Abstract
We present gapless, high-resolution absorption and dispersion spectra obtained with quantum cascade laser frequency combs covering 55 cm. Using phase-sensitive dual comb design, the comb lines are gradually swept over 10 GHz, corresponding to the free spectral range of the laser devices, by applying a current modulation. We show that with interleaving the spectral point spacing is reduced by more than four orders of magnitude over the full spectral span of the frequency comb. The potential of this technique for high-precision gas sensing is illustrated by measuring the low pressure (107 hPa) absorption and dispersion spectra of methane spanning the range of 1170 cm - 1225 cm with a resolution of 0.001 cm.
Cite
@article{arxiv.1910.13973,
title = {High-resolution and gapless dual comb spectroscopy with current-tuned quantum cascade lasers},
author = {Michele Gianella and Akshay Nataraj and Béla Tuzson and Pierre Jouy and Filippos Kapsalidis and Mattias Beck and Markus Mangold and Andreas Hugi and Jérôme Faist and Lukas Emmenegger},
journal= {arXiv preprint arXiv:1910.13973},
year = {2020}
}