The paper considers a model of a multi-aperture wave-front sensor for an active laser beam control system based on the iterative image reconstruction algorithms with limitations, particularly, on the Gerchberg-Saxton algorithm. The specifics of these algorithms is the presence of the so-called divergence factor which is characterized by obtaining “successful” and “unsuccessful” solutions, and may be clarified by stagnation conditions available (or by local extrema). The use of global optimization methods allows to avoid this constraint and to build quite an effective strategy for retrieving phase information. An experimental research was conducted to restore phase information using this method. For this purpose, a model of a seven-channel laser system with a different phase shift was developed.

Keywords: multichannel laser systems, wavefront sensor, Gerchberg-Saxton algorithm, physical modeling, image reconstruction, phase retrieval

The model drum fitofilter based on Caulerpa prolifera is considered. The optimal intensity characteristics received. The parameters of lighting, minimizing the cyanobacteria growth are determined. Optical image processing algorithms of producing a predetermined light intensity distribution suggested.

Keywords: Gerchberg-Saxton algorythm, aquaculture, Caulerpa, algofiltre