TITLE

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

AUTHOR(S)
Tsung-Yu Kao; Qing Hu; Reno, John L.
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p101106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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)≈10°. 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.
ACCESSION #
48591076

 

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