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Diffractive optical elements and quasioptical schemes for experiments on a high-power terahertz free-electron laser |
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| Authors: | N A Vinokurov S A Zhigach B A Knyazev A V Konysheva G N Kulipanov L A Merzhievsky I A Polskikh V S Cherkassky |
| Affiliation: | 1. G. I. Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences, Russia 2. Novosibirsk State University, Russia 3. Novosibirsk State Technical University, Russia 4. M. A. Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia |
| Abstract: | We have developed reflective diffraction optical elements (DOE) for focusing monochromatic coherent radiation of 400 W terahertz Novosibirsk free-electron laser (FEL). Operational characteristics of two modifications of the refractive kinoform lenses were studied. Quasioptical Toepler system with terahertz radiation recording by a thermosensitive luminescent screen was fabricated for the examination of film and solid deformation. A system for real-time terahertz radioscopy of objects with image recording with a microbolometer matrix (MBM) was fabricated. Images of objects illuminated with a plane wave or diffuse radiation were studied with the MBM. It was shown that the speckle pattern, which appears in the second case, can be averaged by means of the scatterer rotation. |
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