Long wavelength distributed feedback tapered quantum cascade lasers

We present a study on distributed feedback tapered quantum cascade lasers emitting at 14 µm. The fabricated lasers with taper angles between 0° and 3° exhibited output powers scaling in accordance with the active zone volume increase. Reduced divergence angles as small as 4.2° have been obtained wit...

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Bibliographic Details
Published in:Optics express 2024-07, Vol.32 (15), p.26925
Main Authors: Pinto, Davide, Díaz Thomas, Daniel Andres, Loghmari, Zeineb, Kinjalk, Kumar, Teissier, Roland, Bahriz, Michael, Lendl, Bernhard, Baranov, Alexei N
Format: Article
Language:English
Subjects:
Engineering Sciences
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Summary:We present a study on distributed feedback tapered quantum cascade lasers emitting at 14 µm. The fabricated lasers with taper angles between 0° and 3° exhibited output powers scaling in accordance with the active zone volume increase. Reduced divergence angles as small as 4.2° have been obtained with diffraction limited-beam quality (M  ≈ 1). With a first order Bragg-grating for single longitudinal mode selection, continuous wave operation was demonstrated up to almost room temperature with side-mode suppression ratios greater than 20 dB.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.521039