Phase-locked arrays of surface-emitting terahertz quantum-cascade lasers

被引：45
|
作者：
Kao, Tsung-Yu [1 ]
Hu, Qing [1 ]
Reno, John L. [2 ]
机构：
[1] MIT, Dept Elect Engn & Comp Sci, Elect Res Lab, Cambridge, MA 02139 USA
[2] Sandia Natl Labs, Dept 1123, Albuquerque, NM 87185 USA
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 10期
基金：
美国国家科学基金会;
关键词：
METAL WAVE-GUIDE; ANTIGUIDES;
D O I：
10.1063/1.3358134
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report the demonstration of phase-locked arrays of surface-emitting distributed-feedback (DFB) terahertz quantum-cascade lasers with single-mode operations. Carefully designed "phase sector" locks several surface-emitting DFB laser ridges in-phase, creating tighter beam-patterns along the phased-array direction with full width at half maximum (FWHM) approximate to 10 degrees. In addition, the phase sector can be individually biased to provide a mechanism of frequency tuning through gain-induced optical index change, without significantly affecting the output power levels. A tuning range of 1.5 GHz around 3.9 THz was achieved. This fine tunability could be utilized to frequency-or phase-lock the DFB array to an external reference. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3358134]
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页数：3
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