Rapid focusing of light through turbid water based on a digital micromirror device

The strong scattering and time variability of dynamic scattering media pose a major challenge to optical focusing and imaging applications. In this paper, a feedback wavefront shaping technology based on digital micromirror devices is proposed, which combines the hardware design and algorithm optimization. Through a new hardware-triggered image acquisition system and dynamic subgroup genetic algorithm, the image acquisition rate and focusing efficiency are significantly improved, and the light is quickly focused in dynamic turbid water. The imaging speed is about 34.89 times that of the traditional method based on a software-triggered image acquisition system and genetic algorithm. The experimental results of focusing through a milk solution show that this technique has a remarkable effect in improving the efficiency of dynamic focusing and the light intensity of focusing region, which provides an effective optimization strategy for optical imaging technology through a dynamic scattering medium in the future.