Abstract:

The performance of low order correction adaptive optical systemfor non-Kolmogorov turbulence was studied systematically in this dissertation. The spatial and temporal characterizations of phase fluctuations in nonKolmogorov turbulence were analyzed theoretically. The spatial structure function, the temporal structure function and the temporal power spectrum of phase fluctuations were derived. Some new methods of measuring the atmospheric parameters with ShackHartmann wavefront sensor were proposed. The wavefront residual error of low-order correction adaptive optical system was analyzed by introducing the temporal modal correction coefficient and the modal anisoplanatic coefficient. The anisoplanatic error of low-order correction adaptive optical system with the distributed beacons, to our knowledge, was first investigated. Furthermore, according to the calibrated solar granulation images, the performance of the tip-tilt correction adaptive optical systemfor the solar granulation was studied by post processing method.

Key words: adaptive optics, non2Kolmogorov turbulence, partial correction, atmospheric turbulenceextended object, performance analysis