Dynamic (time) characteristics of adaptive systems are analyzed. A common adaptive system with a finite frequency band (or a finite response time) is described as a dynamic constant time-delay system, where time delay is to be much shorter than the time of coherence radius transfer through an optical beam by a mean wind speed. The coherent beam formation is considered with the use of the reference source. An adaptive system is considered, where the correcting phase is calculated with the use of both its derivatives and the signal, as well as adaptive systems using different time predicting algorithms of correcting signal for future time points. The use of a predicted phase front of the correcting wave allows much longer time delays.
adaptive optics, fluctuations, phase