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Optical Engineering • Open Access

Spectrally resolved modal characteristics of leaky-wave-coupled quantum cascade phase-locked laser arrays
Author(s): Chris Sigler; Ricky D. Gibson; Colin Boyle; Jeremy D. Kirch; Donald F. Lindberg; Thomas L. Earles; Dan Botez; Luke J. Mawst; Robert G. Bedford

Paper Abstract

The modal characteristics of nonresonant five-element phase-locked arrays of 4.7-μm emitting quantum cascade lasers (QCLs) have been studied using spectrally resolved near- and far-field measurements and correlated with results of device simulation. Devices are fabricated by a two-step metal-organic chemical vapor deposition process and operate predominantly in an in-phase array mode near threshold, although become multimode at higher drive levels. The wide spectral bandwidth of the QCL’s core region is found to be a factor in promoting multispatial-mode operation at high drive levels above threshold. An optimized resonant-array design is identified to allow sole in-phase array-mode operation to high drive levels above threshold, and indicates that for phase-locked laser arrays full spatial coherence to high output powers does not require full temporal coherence.

Paper Details

Date Published: 19 September 2017
PDF: 13 pages
Opt. Eng. 57(1) 011013 doi: 10.1117/1.OE.57.1.011013
Published in: Optical Engineering Volume 57, Issue 1
Show Author Affiliations
Chris Sigler, Univ. of Wisconsin-Madison (United States)
Ricky D. Gibson, Univ. of Dayton Research Institute (United States)
Air Force Research Lab. (United States)
Colin Boyle, Univ. of Wisconsin-Madison (United States)
Jeremy D. Kirch, Univ. of Wisconsin-Madison (United States)
Donald F. Lindberg, Intraband, LLC (United States)
Thomas L. Earles, Intraband, LLC (United States)
Dan Botez, Univ. of Wisconsin-Madison (United States)
Luke J. Mawst, Univ. of Wisconsin-Madison (United States)
Robert G. Bedford, Air Force Research Lab. (United States)

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