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Proceedings Paper

Broadband monolithically tunable quantum cascade lasers
Author(s): Wenjia Zhou; Ryan McClintock; Donghai Wu; Steven Slivken; Manijeh Razeghi
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Paper 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.

Paper Details

Date Published: 26 January 2018
PDF: 9 pages
Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105400A (26 January 2018); doi: 10.1117/12.2297479
Show Author Affiliations
Wenjia Zhou, Northwestern Univ. (United States)
Ryan McClintock, Northwestern Univ. (United States)
Donghai Wu, Northwestern Univ. (United States)
Steven Slivken, Northwestern Univ. (United States)
Manijeh Razeghi, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 10540:
Quantum Sensing and Nano Electronics and Photonics XV
Manijeh Razeghi; Gail J. Brown; Jay S. Lewis; Giuseppe Leo, Editor(s)

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