Open AccessGain-switched semiconductor lasers with pulsed excitation and optical injection for dual-comb spectroscopy
Author(s) -
Clara Quevedo-Galán,
Vicente Durán,
Alejandro Rosado,
A. Pérez-Serrano,
J. M. G. Tijero,
I. Esquivias
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.404398
Subject(s) - laser , optics , semiconductor laser theory , materials science , spectroscopy , duty cycle , optoelectronics , semiconductor optical gain , semiconductor , tunable laser , physics , power (physics) , quantum mechanics
In this work we demonstrate the capability of two gain-switched optically injected semiconductor lasers to perform high-resolution dual-comb spectroscopy. The use of low duty cycle pulse trains to gain switch the lasers, combined with optical injection, allows us to obtain flat-topped optical frequency combs with 350 optical lines (within 10 dB) spaced by 100 MHz. These frequency combs significantly improve the spectral resolution reported so far on dual-comb spectroscopy with gain-switched laser diodes. We evaluate the performance of our system by measuring the transmission profile of an absorption line of H 13 CN at the C-band, analyzing the attainable signal-to-noise ratio for a range of averaging times.