Intrinsic stability of quantum cascade lasers against optical feedback

Year: 2013

Authors: Mezzapesa F. P., Columbo L. L., Brambilla M., Dabbicco M., Borri S., Vitiello M. S., Beere H. E., Ritchie D. A., Scamarcio G.

Autors Affiliation: CNR-IFN UOS Bari, via Amendola 173, I-70126 Bari, Italy; Dipartimento Interateneo di Fisica, Università degli Studi e Politecnico di Bari, via Amendola 173, I-70126 Bari, Italy; Dipartimento di Scienza ed Alta tecnologia, Università dell’Insubria,via Valleggio 11, 22100 Como, Italy; NEST, CNR – Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy; Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, UK

Abstract: We study the time dependence of the optical power emitted by terahertz and mid-IR quantum cascade lasers in presence of optical reinjection and demonstrate unprecedented continuous wave (CW) emission stability for strong feedback. We show that the absence of coherence collapse or other CW instabilities typical of diode lasers is inherently associated with the high value of the photon to carrier lifetime ratio and the negligible linewidth enhancement factor of quantum cascade lasers. (C) 2013 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 21 (11)      Pages from: 13748  to: 13757

More Information: This work was supported by partial financial support from MIUR – PON01-2238, PON02-0576 INNOVHEAD and MASSIME. The authors L.L.C. and M.B. acknowledge funding by National Firb Project PHOCOS (Project n. RBFR08E7VA). M.S.V. acknowledges financial support of the Italian Ministry of Education, University, and Research (MIUR) through the program FIRB 2010 – RBFR10LULP \”Fundamental research on terahertz photonic devices\”. The authors acknowledge A. Tredicucci for the design of THz-QCLs and useful discussions.
KeyWords: Quantum cascade lasers, Coherence collapse; Continuous waves; Emission stability; Intrinsic stability; Linewidth enhancement factor; Optical power; Reinjection; Time dependence, Feedback
DOI: 10.1364/OE.21.013748

Citations: 99
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