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Photonics 2016, 3(2), 25; doi:10.3390/photonics3020025

Widely Tunable Monolithic Mid-Infrared Quantum Cascade Lasers Using Super-Structure Grating Reflectors

1
Department of Computer Science and Electrical Engineering, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
2
Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan
3
Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
*
Author to whom correspondence should be addressed.
Received: 1 April 2016 / Revised: 28 April 2016 / Accepted: 29 April 2016 / Published: 3 May 2016
(This article belongs to the Special Issue Quantum Cascade Lasers - Advances and New Applications)
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Abstract

A monolithic, three-section, and widely tunable mid-infrared (mid-IR) quantum cascade laser (QCL) is demonstrated. This electrically tuned laser consists of a gain section placed between two super structure grating (SSG) distributed Bragg reflectors (DBRs). By varying the injection currents to the two grating sections of this device, its emission wavelength can be tuned from 4.58 μm to 4.77 μm (90 cm−1) with a supermode spacing of 30 nm. This type of SSG-DBR QCLs can be a compact replacement for the external cavity QCL. It has great potential to achieve gap-free and even further tuning ranges for sensor applications. View Full-Text
Keywords: tunable semiconductor lasers; quantum cascade lasers; diffraction gratings; integrated optics tunable semiconductor lasers; quantum cascade lasers; diffraction gratings; integrated optics
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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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Guo, D.; Li, J.-Y.; Cheng, L.; Chen, X.; Worchesky, T.; Choa, F.-S. Widely Tunable Monolithic Mid-Infrared Quantum Cascade Lasers Using Super-Structure Grating Reflectors. Photonics 2016, 3, 25.

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