We have developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission frequency and the output beam direction independently. The spatial refractive index modulation of the gratings necessary to provide optical feedback at a fixed frequency, and simultaneously, a far-field emission pattern centered at controlled angles, was designed through use of an appropriate wavevector scattering model. Single mode terahertz (THz) emission at angles tuned by design between 0 degrees and 50 degrees was realized, leading to an original phase-matching approach for highly collimated THz quantum cascade lasers.

Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings

TREDICUCCI, ALESSANDRO;
2015

Abstract

We have developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission frequency and the output beam direction independently. The spatial refractive index modulation of the gratings necessary to provide optical feedback at a fixed frequency, and simultaneously, a far-field emission pattern centered at controlled angles, was designed through use of an appropriate wavevector scattering model. Single mode terahertz (THz) emission at angles tuned by design between 0 degrees and 50 degrees was realized, leading to an original phase-matching approach for highly collimated THz quantum cascade lasers.
Castellano, F.; Zanotto, S.; Li, L. H.; Pitanti, A.; Tredicucci, Alessandro; Linfield, E. H.; Davies, A. G.; Vitiello, M. S.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/705463
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