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Acknowledgement to Reviewers of Photonics in 2018
Open AccessFeature PaperArticle

Multi-Spectral Quantum Cascade Lasers on Silicon With Integrated Multiplexers

1
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA
2
Code 5613, Naval Research Laboratory, Washington, DC 20375, USA
*
Author to whom correspondence should be addressed.
Current address: Applied Physics Division, National Institute of Standards and Technology, Boulder, CO 80305, USA.
Photonics 2019, 6(1), 6; https://doi.org/10.3390/photonics6010006
Received: 3 January 2019 / Revised: 16 January 2019 / Accepted: 22 January 2019 / Published: 24 January 2019
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 ∼4.7 µm 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. View Full-Text
Keywords: quantum cascade laser; silicon photonics; distributed feedback laser; mid-infrared; arrayed waveguide grating quantum cascade laser; silicon photonics; distributed feedback laser; mid-infrared; arrayed waveguide grating
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MDPI and ACS Style

Stanton, E.J.; Spott, A.; Peters, J.; Davenport, M.L.; Malik, A.; Volet, N.; Liu, J.; Merritt, C.D.; Vurgaftman, I.; Kim, C.S.; Meyer, J.R.; Bowers, J.E. Multi-Spectral Quantum Cascade Lasers on Silicon With Integrated Multiplexers. Photonics 2019, 6, 6.

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