Heat and thermodeformation characteristics of laser mirrors based on powder and felt porous structures cooled by dielectric and liquid metal heat carriers are theoretically investigated. In the case of the heat carriers considered, it is possible to widely vary the regimes of intense heat mass transfer in porous heat exchangers of laser mirrors, whereas use of liquid metal cooling with porous structure fabricated from low coefficient thermal expansion material opens new possibilities in development of especially accurate reflectors with very high optical damage thresholds.

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