期刊
IEEE JOURNAL OF QUANTUM ELECTRONICS
卷 42, 期 3-4, 页码 257-265出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2005.863138
关键词
coupling coefficients; distributed feedback (DFB) lasers; Floquet-Bloch expansion; quantum-cascade laser; surface emission
An analysis of surface-emitting terahertz quantum-cascade lasers operating at wavelengths near 100 mu m 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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