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Vertically emitting terahertz quantum cascade ring lasers

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9 Author(s)
Mujagic, Elvis ; Institute for Solid State Electronics, TU Vienna, Floragasse 7, A-1040 Vienna, Austria ; Deutsch, Christoph ; Detz, Hermann ; Klang, P.
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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.

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Applied Physics Letters  (Volume:95 ,  Issue: 1 )