Substrate-emitting ring interband cascade lasers
Date
26/10/2017Author
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Abstract
We demonstrate interband cascade lasers fabricated into ring-shaped cavities with vertical light emission through the substrate at a wavelength of λ ≈ 3.7 µm. The out-coupling mechanism is based on a metallized second-order distributed feedback grating. At room-temperature, a pulsed threshold current-density of 0.75 kA/cm2 and a temperature-tuning rate of 0.3 nm/°C is measured. In contrast to the azimuthal polarization of ring quantum cascade lasers, we observe a radial polarization of the projected nearfield of ring interband cascade lasers. These findings underline the fundamental physical difference between light generation in interband and intersubband cascade lasers, offering new perspectives for device integration.
Citation
Holzbauer , M , Szedlak , R , Detz , H , Weih , R , Höfling , S , Schrenk , W , Koeth , J & Strasser , G 2017 , ' Substrate-emitting ring interband cascade lasers ' , Applied Physics Letters , vol. 111 , no. 17 , 171101 . https://doi.org/10.1063/1.4989514
Publication
Applied Physics Letters
Status
Peer reviewed
ISSN
0003-6951Type
Journal article
Rights
Copyright the Author(s) 2017. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Description
The authors acknowledge the support by the Austrian Science Fund (FWF) projects P26100-N27 (H2N) and NextLite (F4909-N23), and the State of Bavaria. HD acknowledges financial support through an APART fellowship from the Austrian Academy of Sciences.Collections
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