Substrate-emitting ring interband cascade lasers

Martin Holzbauer, Rolf Szedlak, Hermann Detz, Robert Weih, Sven Höfling, Werner Schrenk, Johannes Koeth, Gottfried Strasser

Research output: Contribution to journalArticlepeer-review

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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.
Original languageEnglish
Article number171101
Number of pages4
JournalApplied Physics Letters
Issue number17
Publication statusPublished - 26 Oct 2017


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