Optimization of the beam shaping with a dynamic phase spatial light modulator

Abstract

Several issues on the optimal diffractive beam shaping with a dynamic phase spatial light modulator are addressed. As for design theories, the optimal design method of the phase holograms considering the functional relationship between phase and amplitude modulations of the phase spatial light modulator is described. To achieve the optimal trade-off between diffraction efficiency and smoothness of the obtained diffraction images, the iterative Fourier transform algorithm with adaptive regularization parameter distribution is devised. Regarding experimental issues, we propose a beam shaping system configuration with the genetic feedback tuning loop in which the simplified genetic algorithm is employed to finely compensate the internal aberration of the optics in the beam shaping system. It is shown that the real-time tuning of the phase holograms for accurate beam shaping is possible using the dynamic behavior of the spatial light modulator.