The successful development of mid-infrared (2-5µm) lasers monolithically integrated with Si-based photonics opens a door to realization of low-cost smart optical gas sensors for environmental monitoring and control of industrial processes. We will discuss our recent results on interband cascade lasers emitting between 3 and 4 µm grown on silicon substrates demonstrating high tolerance of these devices to threading dislocations. The high performance of the developed lasers makes them a good candidate for use as light sources in silicon photonics.
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