Abstract
Quantum cascade distributed feedback (QC-DFB) lasers based on a heterogeneous-cascade two-wavelength active waveguide core and a multisectioned cavity featuring two different Bragg gratings are demonstrated. Optimised lasers display singlemode emission at λ∼5.0 and 7.5 µm simultaneously and a tunability on both modes equal to single-wavelength QC-DFB lasers.
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