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, , which then couples efficiently to the free-space Gaussian mode, . 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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