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Illuminated by ultrashort optical pulses, large area multiplex terahertz semiconductor emitters that work on photo-Dember currents and Schottky potentials radiate a directional electromagnetic terahertz pulse which is controlled by the angular spectrum of the incident optical beam. Using the lens that focuses the incident near infra-red pulse, we have demonstrated THz emission focusing in free space...
The first demonstration of a waveguide laser in Fe:ZnSe is presented. The waveguide laser produces 49 mW of output power at 4122 nm with a spectral bandwidth of 6 nm FWHM.
A 500 µm Cr:ZnSe thin disk gain element was pumped at five different pump diameters. Laser output versus pump power was measured. Slope efficiency, threshold, and maximum power versus pump spot size were then extracted.
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