Measurements of the linewidth enhancement factor of mid-infrared quantum cascade lasers by different optical feedback techniques

Journal Article · Fri Jan 15 00:00:00 EST 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4940767· OSTI ID:22492409

Michel, F.; Pawlus, R.; Elsässer, W. ^[1]; Schires, K. ^[2]; Carras, M. ^[3]; Grillot, F. ^[2]

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1. Technische Universität Darmstadt, Schlossgartenstr. 7, D-64289 Darmstadt (Germany)
2. Université Paris-Saclay, Télécom ParisTech, CNRS LTCI, 46 rue Barrault, F-75013 Paris (France)
3. MirSense, 8 avenue de la Vauve, F-91120 Palaiseau (France)

Precise knowledge of the linewidth enhancement factor of a semiconductor laser under actual operating conditions is of prime importance since this parameter dictates various phenomena such as linewidth broadening or optical nonlinearities enhancement. The above-threshold linewidth enhancement factor of a mid-infrared quantum cascade laser structure operated at 10{sup ∘}C is determined experimentally using two different methods based on optical feedback. Both Fabry-Perot and distributed feedback quantum cascade lasers based on the same active area design are studied, the former by following the wavelength shift as a function of the feedback strength and the latter by self-mixing interferometry. The results are consistent and unveil a clear pump current dependence of the linewidth enhancement factor, with values ranging from 0.8 to about 3.

• OSTI ID: 22492409
• Journal Information: AIP Advances, Vol. 6, Issue 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DESIGN
ELECTRIC CURRENTS
FABRY-PEROT INTERFEROMETER
FEEDBACK
INTERFEROMETRY
LINE WIDTHS
NONLINEAR PROBLEMS
SEMICONDUCTOR LASERS
WAVELENGTHS