High-power surface emission from terahertz distributed feedback lasers with a dual-slit unit cell

Mahler, Lukas; Tredicucci, Alessandro; Beltram, Fabio; Walther, Christoph; Faist, Jérôme; Beere, Harvey E.; Ritchie, David A.
May 2010
Applied Physics Letters;5/10/2010, Vol. 96 Issue 19, p191109
Academic Journal
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.


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