Evaluating the coherence and time-domain profile of quantum cascade laser frequency combs

Recently, much attention has been focused on the generation of optical frequency combs from quantum cascade lasers. We discuss how fast detectors can be used to demonstrate the mutual coherence of such combs, and present an inequality that can be used to quantitatively evaluate their performance. We...

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Bibliographic Details
Published in:Optics express 2015-01, Vol.23 (2), p.1190-1202
Main Authors: Burghoff, David, Yang, Yang, Hayton, Darren J, Gao, Jian-Rong, Reno, John L, Hu, Qing
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ENGINEERING
quantum cascade
semiconductor lasers
ultrafast devices
ultrafast measurements
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Summary:Recently, much attention has been focused on the generation of optical frequency combs from quantum cascade lasers. We discuss how fast detectors can be used to demonstrate the mutual coherence of such combs, and present an inequality that can be used to quantitatively evaluate their performance. We discuss several technical issues related to shifted wave interference Fourier Transform spectroscopy (SWIFTS), and show how such measurements can be used to elucidate the time-domain properties of such combs, showing that they can possess signatures of both frequency-modulation and amplitude-modulation.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.001190