Evidence of Linear Chirp in Mid-Infrared Quantum Cascade Lasers
Optics
2018-04-13 v1
Abstract
We measure the inter-modal phase relation of a quantum cascade laser frequency comb operating at 8 um using a coherent beatnote spectroscopy. We find these phases to be reproducible after cycling the power of the device, and to be smoothly varying with driving current. Moreover, these phases describe a comb state exhibiting a simple, linear chirp, which in fact corresponds to the lowest state of chirp to minimise the amplitude modulation, as required for combs driven by four wave mixing in a gain medium with a short gain recovery lifetime.
Keywords
Cite
@article{arxiv.1804.04162,
title = {Evidence of Linear Chirp in Mid-Infrared Quantum Cascade Lasers},
author = {Matthew Singleton and Pierre Jouy and Mattias Beck and Jérôme Faist},
journal= {arXiv preprint arXiv:1804.04162},
year = {2018}
}