Dynamic light field synthesis using spatial light modulator: system optimization with genetic feedback tuning loop and optical implementation of iterative fractional Fourier transform algorithm

摘要

In this paper, our recent works on dynamic light field synthesis engineering using spatial light modulators are presented. The combination of optimization techniques in theoretical design methods and experimental methods with spatial light modulators is a main motivation of our study. The firstly discussed system is the genetic feedback tuning loop for the optimal system tuning and aberration compensation. The genetic algorithm is embedded into the light field synthesis system and the iterative system tuning procedure is devised for optimizing and tuning the real system. The secondly introduced topic is the experimental implementation of the iterative fractional Fourier transform algorithm for designing the phase profiles of phase holograms. The ath fractional Fourier transform and its inverse transform is optically implemented. The light field synthesis systems with optically implemented iterative fractional Fourier transform are proposed. In the proposed systems, using the phase-shifting digital holography technique, the phase profile of real light field is measured, and with phase spatial light modulator the light field is generated. It is shown that the diffraction image measured at each iteration step evolves to the optimal goal. Some experimental results validating the proposed schemes are presented.