A. V. Trilis

One-stage free-vortex aerodynamic window with pressure ratio 100 and atmospheric exhaust

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≥50 is difficult to achieve. To achieve the pressure ratio 100 in free vortex single-stage AW the method of stabilizing of boundary 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.

Lidar system for atmospheric turbulence measurement with Mersen telescope

In this work the lidar system for measurements of atmospheric turbulence structural function Cn2 are presented. Method of such measurements is based on increasing of focal spot on the receiver after beam pass through turbulent atmosphere. In this work the receiving-transmission system on the base of Mersen telescope with main mirror diameter 0.5m is used. Features connected with optical system aberrations are considered. The results of experimental investigation are presented.

SPECIAL FEATURES OF THE INTERFEROMETRY OF RADIALLY LOADED LARGE GLASS LASER MATRICES

We present the results of computational investigation of the loss in contrast of interference patterns of lateral shear with a reference beam. We consider the behavior of the degree of coherence over the active element cross-section and in time after starting the laser pumping system in operation, as well as the behavior of the integral degree of probing-radiation depolarization.

Space-time extents of optical distortions in the cylindrical active element of a high-power solid-state laser

Results of investigations of the space-time structure of distortions in the glass active element of a high-power solid-state laser with and without cooling of the active element are reported. A possibility is shown and the domains of applicability are determined for correction of spherical distortions by adjustment of a telescopic resonator.