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Continuous-wave operation of vertically emitting ring interband cascade lasers at room temperature

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Hedwig Knoetig, Borislav Hinkov, Robert Weih, Sven Hoefling, Johannes Koeth, Gottfried Strasser

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We present vertical light emission in continuous-wave mode from an interband cascade laser (ICL) at a record temperature of up to 38 °C. These results pave the way toward a more efficient and compact integration of this technology in mobile spectroscopic applications. Our approach employs ring cavity ICLs that are mounted epi-side down for efficient heat extraction from the devices. The vertical single-mode emission relies on a metallized second-order distributed-feedback grating designed for an emission wavelength of 3.8 μm. A single lateral mode operation is favored by a narrow waveguide width of 4 μm. Optical output powers of more than 6 mW were measured at 20 °C for rings with a diameter of ∼800 μm. At this temperature, the threshold current-density amounted to 0.60 kA/cm2 and the device showed continuous current and temperature tuning rates of 0.06 nm/mA and 0.37 nm/K, respectively.


Original languageEnglish
Article number131101
Number of pages5
JournalApplied Physics Letters
Issue number13
Early online date30 Mar 2020
Publication statusPublished - 30 Mar 2020

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