Open AccessFrequency noise reduction of delay-coupled quantum cascade lasers
Author(s) -
Xiangyu Zhou,
XingGuang Wang,
Binbin Zhao,
Qifeng Liao
Publication year - 2021
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.415997
Subject(s) - laser linewidth , relative intensity noise , cascade , phase noise , quantum noise , optics , noise (video) , physics , laser , coupling (piping) , noise reduction , semiconductor laser theory , materials science , quantum , acoustics , computer science , chemistry , quantum mechanics , chromatography , artificial intelligence , metallurgy , image (mathematics)
This work theoretically investigates the frequency noise and spectral linewidth characteristics of mutually delay-coupled quantum cascade lasers, which are operated in the stable locking regime. We demonstrate that the mutual injection significantly reduces the frequency noise at proper coupling phases. However, the relative intensity noise is insensitive to the mutual injection. Influences of the pump current, the linewidth broadening factor, the coupling phase, and the delay time on the frequency noise are discussed as well. In addition, it is found that the appearance of multiple compound laser modes can deteriorate the frequency noise performance of the lasers.