Optimization of Iterative Algorithms for Focusing Light Through Scattering Media

A light beam transmitted through scattering media usually turns into disordered speckles. Fortunately, there are iterative algorithms to focus light transmitted through scattering media using a spatial phase modulator (SPM). In this work, we optimized the conventional iterative algorithms to achieve greater efficiency via theory and simulations. Two independent processes, characterizing the transmission matrix (TM) of the scattering media and calculating the phase compensation of the SPM, are included in our optimized algorithm. While the TM of the scattering media is determined through the interference effect and the light reciprocity principle, the phase compensation of the SPM is calculated using the Rayleigh-Sommerfeld diffraction theory. By addressing these two processes separately, accelerating the process of characterizing the TM of the scattering media, and theoretically calculating the phase compensation of the SPM, our optimized algorithm is helpful for fast imaging through scattering media.