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Large-sized mirrors for power opticsa Institute of Problems of Electrophysics of the Russian Academy of Sciences, Dvortsovaya nab. 18, St. Petersburg, 19118, Russian Federation b Prokhorov General Physics Institute of the Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russian Federation Researches into the fabrication of large-sized mirrors for power optics from such materials as invar, SiC, and a C—Si—SiC composite material are discussed. Methods to calculate thermal deformations in cooled mirrors under irradiation with light have been developed. A technique to reduce the mirror weight is suggested that is based on using materials consisting of multilayered cellular structures and porous materials.
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