We present a surface emitting distributed feedback terahertz laser resonator based on a dual-slit configuration. With the spacing of the slits as a parameter, the surface losses of the lasers can be chosen over a large range, while keeping slits narrow for optimum current injection. Quantum cascade devices based on a double metal waveguide showed slope efficiencies up to 40 mW/A and peak powers of more than 20 mW. The efficient radiation out-coupling does not depend on boundary conditions, and therefore would allow the application to large-area devices, making this an ideal resonator for high-power surface emission. (C) 2010 American Institute of Physics. [doi:10.1063/1.3430522]
Autori interni: | |
Autori: | Mahler L.; Tredicucci A.; Beltram F.; Walther C.; Faist J.; Beere H. E.; Ritchie D. A. |
Titolo: | High-power surface emission from terahertz distributed feedback lasers with a dual-slit unit cell |
Anno del prodotto: | 2010 |
Digital Object Identifier (DOI): | 10.1063/1.3430522 |
Appare nelle tipologie: | 1.1 Articolo in rivista |