Perfectly phase-matched third-order distributed feedback terahertz quantum-cascade lasers
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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 ≈ 6 × 11°) divergence. A similar device with 40 apertures shows more than 5 mW of optical power with slope efficiency ~ 140 mW/A at 10 K pulsed operation.
Date issued
2012-05Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Optics Letters
Publisher
Optical Society of America
Citation
Kao, Tsung-Yu, Qing Hu, and John L. Reno. “Perfectly Phase-Matched Third-Order Distributed Feedback Terahertz Quantum-Cascade Lasers.” Optics Letters 37, no. 11 (June 1, 2012): 2070. © 2012 Optical Society of America
Version: Final published version
ISSN
0146-9592
1539-4794