The concept of plasma separation of oxide mixtures includes, as one of its stages, the conversion of these mixtures into a plasma flow. In the framework of this work, an experimental study was conducted on the processes of converting a condensed mixture of model substances into the vapor phase using radiation from a quasi-continuous laser with a wavelength of 1067 nm. The possibility of evaporating in vacuum a target consisting of a mixture of refractory complex oxides of cerium and yttrium has been experimentally demonstrated. The evaporating productivity was about 10 grams per hour in conditions required for a vapor source in the plasma component separation process. The radiation power density, at which an optimal relationship between the rates of evaporation and undesirable production of coarse-dispersed particles in the target disintegration products is observed, has been determined, namely at a level of 1· 10⁶ W/cm². At the non-stationary stage of the process, incongruent evaporation of components is observed, which can subsequently be used for enriching the target material with the least volatile components. The implementation of such enrichment will conceptually allow reducing the requirements for the productivity of the plasma separation process. Keywords: laser evaporation, plasma separation, rare-earth oxides, fiber lasers.

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