TITLE

Vertically emitting terahertz quantum cascade ring lasers

AUTHOR(S)
Mujagić, Elvis; Deutsch, Christoph; Detz, Hermann; Klang, Pavel; Nobile, Michele; Andrews, Aaron Maxwell; Schrenk, Werner; Unterrainer, Karl; Strasser, Gottfried
PUB. DATE
July 2009
SOURCE
Applied Physics Letters;7/6/2009, Vol. 95 Issue 1, p011120
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe the fabrication and operation of vertically emitting distributed feedback quantum cascade ring lasers operating in the terahertz frequency range. A twofold increase in radiation efficiency is observed as compared to Fabry–Pérot lasers. The emitters exhibit a robust single-mode operation around 3.2 THz with a side mode suppression ratio higher than 30 dB. Modal and threshold characteristics are investigated by performing finite element simulations with results in good agreement with experiments. The ring-shaped resonator facilitates beam collimation which results in a symmetric far-field profile.
ACCESSION #
43158421

 

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