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The aerodynamic windows (AW) are intended for a high power extraction from the gas laser optical cavity, where the pressure is much lower than environment pressure. The main requirements for the aerodynamic windows are to satisfy a low level of optical disturbances in a laser beam extraction channel and an air leakage absence into the optical cavity.Free vortex AW are most economic from a point of working gas consumption and the greatest pressure differential is realized on them at an exhaust to atmosphere. For ideal gas it is possible to receive as much as large pressure differential, however for real gas a pressure differential more than P 5 0 is difficult to achieve.To achieve the pressure ratio 100 in free vortex single-stage AW the method of stabilizing ofboundary layer was used. The gas of curtain was decelerated in the diffuser and was exhausted into the atmosphere straightly. The pressure recovery improvement was achieved by using the boundary layer blowing inside the diffuser. Only 10% of total mass flow was used for boundary layer blowing

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U/Fe multilayers were fabricated with the expectation that the magnetic anisotropy behaviour (perpendicular magnetization of the Fe layers) seen in analogous multilayers of Ce and Fe would occur also in these multilayers. This behaviour has not been observed and it is suspected that the reason is connected with the nature of the interfaces between the U and Fe layers. In this investigation Mössbauer spectra of a standard U/Fe multilayer are compared to those of samples that may reproduce the conditions of the interface. The results show that samples of co-sputtered U and Fe simulate reasonably well the interface spectra and that the non-magnetic Fe seen in this material would inhibit magnetism induced in the U layers via the adjacent Fe layers and hence explain the absence of the expected magnetic anisotropy in U/Fe multilayers.