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Engineering Multi-Section Quantum Cascade Lasers for Broadband Tuning

Center for Quantum Devices, Electrical Engineering and Computer Science Department, Northwestern University, Evanston, IL 60208, USA
Author to whom correspondence should be addressed.
Photonics 2016, 3(3), 41;
Received: 1 June 2016 / Revised: 17 June 2016 / Accepted: 17 June 2016 / Published: 27 June 2016
(This article belongs to the Special Issue Quantum Cascade Lasers - Advances and New Applications)
PDF [1730 KB, uploaded 27 June 2016]


In an effort to overcome current limitations to electrical tuning of quantum cascade lasers, a strategy is proposed which combines heterogeneous quantum cascade laser gain engineering with sampled grating architectures. This approach seeks to not only widen the accessible spectral range for an individual emitter, but also compensate for functional non-uniformity of reflectivity and gain lineshapes. A trial laser with a dual wavelength core is presented which exhibits electroluminescence over a 750 cm−1 range and discrete single mode laser emission over a 700 cm−1 range. Electrical tuning over 180 cm−1 is demonstrated with a simple sampled grating design. A path forward to even wider tuning is also described using more sophisticated gain and grating design principles. View Full-Text
Keywords: monolithic tunable laser; quantum cascade laser; sampled grating monolithic tunable laser; quantum cascade laser; sampled grating

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Slivken, S.; Razeghi, M. Engineering Multi-Section Quantum Cascade Lasers for Broadband Tuning. Photonics 2016, 3, 41.

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