Journal
OPTICS LETTERS
Volume 37, Issue 11, Pages 2070-2072Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.002070
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- NASA
- NSF
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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We report a novel laser cavity design in third-order distributed feedback (DFB) terahertz quantum-cascade lasers based on a perfectly phase-matching technique. This approach substantially increases the usable length of the third-order DFB laser and leads to narrow beam patterns. Single frequency emissions from 151 apertures (5.6 mm long device) are coherently added up to form a narrow beam with (FWHM approximate to 6 x 11 degrees) divergence. A similar device with 40 apertures shows more than 5 mW of optical power with slope efficiency similar to 140 mW/A at 10 K pulsed operation. (C) 2012 Optical Society of America
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