Substrate-emitting ring interband cascade lasers
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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.
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 . DOI: 10.1063/1.4989514
Applied Physics Letters
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/).
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.
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