Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry

Keeley, James, Freeman, Joshua , Bertling, Karl , Lim, Yah L. , Mohandas, Reshma A. , Taimre, Thomas , Li, Lianhe H. , Indjin, Dragan , Rakic, Aleksandar, Linfeld, Edmund H. , Davies, A. Giles and Dean, Paul (2017) Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry. Scientific Reports, 7 1: 7236.1-7236.9. doi:10.1038/s41598-017-07432-0


Author Keeley, James
Freeman, Joshua
Bertling, Karl
Lim, Yah L.
Mohandas, Reshma A.
Taimre, Thomas
Li, Lianhe H.
Indjin, Dragan
Rakic, Aleksandar
Linfeld, Edmund H.
Davies, A. Giles
Dean, Paul
Title Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2017-08-03
Sub-type Article (original research)
DOI 10.1038/s41598-017-07432-0
Open Access Status DOI
Volume 7
Issue 1
Start page 7236.1
End page 7236.9
Total pages 9
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Subject 1000 General
Abstract The effects of optical feedback (OF) in lasers have been observed since the early days of laser development. While OF can result in undesirable and unpredictable operation in laser systems, it can also cause measurable perturbations to the operating parameters, which can be harnessed for metrological purposes. In this work we exploit this ‘self-mixing’ effect to infer the emission spectrum of a semiconductor laser using a laser-feedback interferometer, in which the terminal voltage of the laser is used to coherently sample the reinjected field. We demonstrate this approach using a terahertz frequency quantum cascade laser operating in both single- and multiple-longitudinal mode regimes, and are able to resolve spectral features not reliably resolved using traditional Fourier transform spectroscopy. We also investigate quantitatively the frequency perturbation of individual laser modes under OF, and find excellent agreement with predictions of the excess phase equation central to the theory of lasers under OF.
Keyword Optical feedback (OF)
Laser
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
HERDC Pre-Audit
School of Information Technology and Electrical Engineering Publications
 
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Created: Fri, 04 Aug 2017, 10:42:37 EST by Karl Bertling on behalf of School of Information Technol and Elec Engineering