An optical scheme of a diode-pumped, two-channel, solid-state laser is considered. The scheme is destined for diagnostics of the physical processes occurring in the divertor area of the tokamak-type fusion facilities by the method of Thomson scattering and has been developed on the basis of modern engineering and technological advancements made in powerful pulse-periodic laser systems. The schemes for the laser diode pumping of the active elements are considered, and the results of thermal and hydraulic calculations of a pumping module are presented. The results of the energy calculation confirm the feasibility of a laser system with technical parameters meeting the requirements of a task assigned.
We propose a novel resonant detector of terahertz radiation based on a heterostructure with an ungated two-dimensional electron channel, with a lateral Schottky junction at one of the channel edges, substantiate its operation, and evaluate the device characteristics. We demonstrate that the detector responsivity can exhibit sharp resonant maxima at the frequencies pertaining to the plasma oscillations. As shown, the peak values of the responsivity of the detector proposed can exceed the responsivity of the standard Schottky detectors by several orders of magnitude if the electron mobility in the channel is sufficiently high.
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