Abstract

We demonstrate that a short hollow dielectric tube can act as a dielectric waveguide and transform the multimode, highly diverging terahertz quantum cascade laser beam into the lowest order dielectric waveguide hybrid mode, EH11, which then couples efficiently to the free-space Gaussian mode, TEM00. This simple approach should enable terahertz quantum cascade lasers to be employed in applications where a spatially coherent beam is required.

© 2007 Optical Society of America

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