Development and creation of powerful technological lasers requires complex solution of problems of optics, quantum electronics and thermal physics. The achieving of stable in time energetic parameters of technological lasers with cooled elements of power (EPO) and adaptive (EAO) optics can be achieved only by a correct choice of their cooling modes, eliminating or compensating negative effects of heating EPO by laser radiation because of principal difference of reflectance of the mirror surface from I. The convective regime of EPO or EAO cooling is mainly used in laser technique and carried out by pumping the coolant through a penetrable disperse compact heat exchanger, on the work surface of which a thermally thin layer, separating radiation and the coolant liquid in heat changer, is made /1,2/. The intensity of heat transter and therefore, the degree of thermostatting of the reflecting surface of EPO are determined by a large number of design and technological factors not always reproducible in the EPO manufacturing. Nevertheless, for EPO, made on the basis of powder porous structures, the level of removing heat fluxes reach 2 . 103 wt/cm2 under the thermal deformation of the mirror surface less than 1 μm, the effective heat transfer factor for a heating mirror surface equal to ̃ 105 wt/m2 . °C in this case /2/.