Electrophysics of a modal multichannel liquid-crystal wavefront corrector

The impedance of a modal multichannel wavefront corrector is studied theoretically and experimentally for the first time. The theoretical model takes into account the dependence of liquid crystal parameters on the control voltage frequency. These dependences were measured separately. It is found that the equivalent capacitance and resistance of the corrector in the frequency region up to 1 kHz are determined by the ionic conductivity of the liquid crystal, whereas at higher frequencies the frequency dependence of the local voltage comes into play. The theoretical results well agree with the experimental data.