Multi-Spectral Quantum Cascade Lasers on Silicon With Integrated Multiplexers by Eric J. Stanton, Alexander Spott, Jon D. Peters, Michael L. Davenport, Aditya Malik, Nicolas Volet, Junqian Liu, Charles D. Merritt, Igor Vurgaftman, Chul Soo Kim, Jerry R. Meyer, John E. Bowers.
Multi-spectral midwave-infrared (mid-IR) lasers are demonstrated by directly bonding quantum cascade epitaxial gain layers to silicon-on-insulator (SOI) waveguides with arrayed waveguide grating (AWG) multiplexers. Arrays of distributed feedback (DFB) and Bragg-reflection (DBR) (QCLs) emitting at ∼4.7 µm wavelength coupled AWGs on the same chip. Low-loss spectral beam combining allows for brightness scaling coupling light generated multiple input QCLs into fundamental mode a single output waveguide. Promising results further improvements in progress. This device can lead compact sensitive chemical detection systems using absorption spectroscopy across broad range mid-IR as well high-brightness multi-spectral source power scaling.
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