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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The hydrogen atom in a strong magnetic field is represented by means of sturmian functions, which offer a complete basis which is well adapted to describing the distortion induced,by the field.Methods of computation of the eigenvalue spectrum using this basis are described, and a critical comparison made with results obtained by use of the incomplete basis of hydrogenic radial functions.A brief account is given of the techniques employed for dealing with the very large matrices appearing in the calculations.