Abstract
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.
Highlights
) in the mid-infrared spectral region, spanning the wavelength range from 2.5 lm to 14 lm.1 this region is of particular interest for gas spectroscopy
We present vertical light emission in continuous-wave mode from an interband cascade laser (ICL) at a record temperature of up to 38 C
While edge-emitting ICLs based on GaSb are operating in cw mode at room temperature,2 vertical light emission has so far been limited to pulsed operation11,12 or to lower temperatures
Summary
) in the mid-infrared spectral region, spanning the wavelength range from 2.5 lm to 14 lm.1 this region is of particular interest for gas spectroscopy. With the aim of achieving vertical light emission in cw mode at room temperature, in this study, we design and realize a ring device based on a second-order distributed-feedback (DFB) grating.
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