Problems of phase compensation under strong intensity and full-aperture tip-tilt correction from LGS

摘要

Modern aspects of adaptive optics are considered. Atmospheric turbulence induces phase distortions of an optical wave which transform into amplitude distortions in the wave cross sections. On a long path intensity fluctuations become so strong that points appear with zero intensity. In such point wave-front distortions are of a spiral structure. Singularity of this type are called wave-front dislocations. Problems of adaptive system development intended for compensation of turbulent distortions are discussed frequently. But still is not clear how the principal characteristics of an adaptive system such a minimum size of element and allowed temporal lag of correction are influenced by intensity fluctuations. Some problems, connected with the development of ground-based adaptive telescope, particularly, with equipping it with an additional optical system for laser guide star formation, are treated in the paper.