Double-waveguide interband cascade laser with dual wavelength emission
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Interband cascade lasers (ICLs) with dual wavelength emission have been realized by utilizing two spatially separated active regions in the same device. The two wavelengths (3.1 and 3.7 µm) were chosen in order to demonstrate that the usual spectral gain bandwidth of an ICL can be overcome. At 20°C, threshold current densities as low as 215 A/cm² (short wavelength) and 158 A/cm² (long wavelength) could be achieved in pulsed mode. It was possible for an epi-up mounted device to maintain dual-wavelength continuous-wave emission up to 0°C. Despite the longer wavelength emission being suppressed at higher temperatures, the shorter wavelength maintained an output power of more than 10 mW at 15°C.
Weih , R , Scheuermann , J , Kamp , M , Koeth , J & Höfling , S 2018 , ' Double-waveguide interband cascade laser with dual wavelength emission ' , Applied Physics Letters , vol. 113 , no. 25 , 251105 . https://doi.org/10.1063/1.5079521
Applied Physics Letters
Copyright © 2018, the Author(s). This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1063/1.5079521