Vadim V. Kijko

Pulse-periodic lasers for lightcraft application

A technique for obtaining a pulse-periodic operating mode of high-power wide-aperture lasers (GDL, HF/DF, COIL) was put forward theoretically and experimentally realized for the case of GDL. The possibility of realizing a pulse-periodic mode in high-power wide-aperture lasers without a sacrifice in average output power was experimentally demonstrated and applicability of the realized approach for lightcraft technology further development is pointed out. Regime of light supported detonation wave and effect of shock waves joining for this particular application were investigated.

Tilt corrector based on spring-type magnetostrictive actuators

Tilt corrector based on a spring-type magnetostrictive actuator (STMA) was investigated for wavefront tilt correction. The STMA is a very efficient type of macroactuator for application in large ground- and space-based adaptive optics. By means of the STMA it is possible to deliver, in a real-time scale (1 to 10 ms), precision displacements in a range up to 100 μm with a 0.1-μm positioning accuracy. On the basis of experimentally investigated static and dynamic characteristics of STMAs the real-time two-coordinate mirror positioning system for precise optical engineering was developed and investigated. A dynamic range of corrected tilts up to 8 arc mm with a frequency range up to 50 Hz delivered by the developed tilt corrector allowed compensation for natural thermoconvectionally induced tilts with accuracy of 0.1 arc sec.

Real-time Hartmann sensor for phase-conjugated adaptive optical system

The purpose of our study is the development of the hardware and the software of a fast- response Hartmann sensor (HS), providing real-time measurements of the WF local tilts, expanding the WF in terms of the 19 low order Cernike polynomials, and estimation of the temporal and spatial WF statistics.