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Surface-Emitting Distributed Feedback Terahertz Quantum-Cascade Lasers in Metal-Metal WaveguidesSingle-mode surface-emitting distributed feedback terahertz quantumcascade lasers operating around 2.9 THz are developed in metal-metal waveguides. A combination of techniques including precise control of phase of reflection at the facets, and u e of metal on the sidewalls to eliminate higher-order lateral modes allow robust single-mode operation over a range of approximately 0.35 THz. Single-lobed far-field radiation pattern is obtained using a pi phase-shift in center of the second-order Bragg grating. A grating device operating at 2.93 THz lased up to 149 K in pulsed mode and a temperature tuning of 19 .7 GHz was observed from 5 K to 147 K. The same device lased up to 78 K in continuous-wave (cw) mode emitting more than 6 m W of cw power at 5 K. ln general, maximum temperature of pulsed operation for grating devices was within a few Kelvin of that of multi-mode Fabry-Perot ridge lasers
Document ID
Document Type
Reprint (Version printed in journal)
Kumar, Sushil
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Williams, Benjamin S.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Qin, Qi
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Lee, Alan W. M.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Hu, Qing
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Reno, John L.
(Sandia National Labs. Albuquerque, NM, United States)
Date Acquired
August 24, 2013
Publication Date
January 8, 2007
Publication Information
Publication: Optics Express
Publisher: Optical Society of America
Volume: 15
Issue: 1
Subject Category
Funding Number(s)
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