Journal
PHOTONICS
Volume 6, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/photonics6010006
Keywords
quantum cascade laser; silicon photonics; distributed feedback laser; mid-infrared; arrayed waveguide grating
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Funding
- Air Force Research Laboratory (AFRL) [FA8650-17-C-5402]
- Office of Naval Research (ONR)
- Swiss National Science Foundation
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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 distributed Bragg-reflection (DBR) quantum cascade lasers (QCLs) emitting at similar to 4.7 mu m wavelength are coupled to AWGs on the same chip. Low-loss spectral beam combining allows for brightness scaling by coupling the light generated by multiple input QCLs into the fundamental mode of a single output waveguide. Promising results are demonstrated and further improvements are in progress. This device can lead to compact and sensitive chemical detection systems using absorption spectroscopy across a broad spectral range in the mid-IR as well as a high-brightness multi-spectral source for power scaling.
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