@inproceedings{8636127e1dbe4eb3bb0d937ffe7c8dc4,
title = "Broadband monolithically tunable quantum cascade lasers",
abstract = "Mid-infrared lasers, emitting in the spectral region of 3-12 μm that contain strong characteristic vibrational transitions of many important molecules, are highly desirable for spectroscopy sensing applications. High efficiency quantum cascade lasers have been demonstrated with up to watt-level output power in the mid-infrared region. However, the wide wavelength tuning, which is critical for spectroscopy applications, is still largely relying on incorporating external gratings, which have stability issues. Here, we demonstrate the development a monolithic, widely tunable quantum cascade laser source emitting between 6.1 and 9.2 μm through an on-chip integration of a sampled grating distributed feedback tunable laser array with a beam combiner. A compact tunable laser system was built to drive the individual lasers within the array and coordinate the driving of the laser array to produce desired wavelength. A broadband spectral measurement (520cm-1) of methane shows excellent agreement with Fourier transform infrared spectrometer measurement. Further optimizations have led to high performance monolithic tunable QCLs with up to 65 mW output while delivering fundamental mode outputs.",
keywords = "broadband, mid-infrared, quantum cascade lasers, single mode, spectroscopy, tunable",
author = "Wenjia Zhou and Ryan McClintock and Donghai Wu and Steven Slivken and Manijeh Razeghi",
note = "Funding Information: This work is partially supported by the Department of Homeland Security Science and Technology Directorate (grant HSHQDC-13-C-00034), National Science Foundation (grants ECCS-1505409 and ECCS-1306397), Naval Air Systems Command (grant N68936-13-C-0124). The authors would like to acknowledge the encouragement and support of all the involved program managers. Funding Information: This work is partially supported by the Department of Homeland Security Science and Technology Direct. (grant HSHQDC-13-C-00034), National Science Foundation (grants ECCS-1505409 and ECCS-1306397), Naval Air Systems Command (grant N68936-13-C-0124).; Quantum Sensing and Nano Electronics and Photonics XV 2018 ; Conference date: 28-01-2018 Through 02-02-2018",
year = "2018",
doi = "10.1117/12.2297479",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Giuseppe Leo and Brown, {Gail J.} and Manijeh Razeghi and Lewis, {Jay S.}",
booktitle = "Quantum Sensing and Nano Electronics and Photonics XV",
}