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Analysis of terahertz surface emitting quantum-cascade lasers

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2 Author(s)
Schubert, Martin ; Cornell Univ., Ithaca, NY, USA ; Rana, Farhan

An analysis of surface-emitting terahertz quantum-cascade lasers operating at wavelengths near 100 μm is presented. The devices use distributed feedback through second-order Bragg metal gratings to generate strong emission of radiation normal to the laser surface. The analysis is based on coupling between the exact Floquet-Bloch eigenmodes of infinite periodic structures in finite length devices. The results show performance of surface-emitting terahertz lasers comparable to edge-emitting devices, with high radiative efficiencies and low threshold gains. Using phase-shifts in the grating, high-quality single-lobe beams in the farfield are obtained.

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Quantum Electronics, IEEE Journal of  (Volume:42 ,  Issue: 3 )