Substrate-emitting ring interband cascade lasers

doi:10.1063/1.4989514

Substrate-emitting ring interband cascade lasers

2017-10-26

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DOI：10.1063/1.4989514

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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 lambda approximate to 3.7 mu m. 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/cm(2) and a temperature-tuning rate of 0.3 nm/degrees C are 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. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Substrate-emitting ring interband cascade lasers

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