Abstract
In this work, a continuous external cavity spectral tuning of 556 cm−1 in the 3–4 μm region is shown for a heterogeneous bound-to-continuum active region design based on the strain-compensated Sb-free material system. The two active regions have center wavelengths at 3.3 μm and 3.7 μm with a total modal overlap factor of 86%. We also show an effective multilayer broadband anti-reflectivity coating in the 3–4 μm region reducing the overall reflectivity over the whole tuning range below 1.4%.
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