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Modulating the light field scattered by scattering media has potential application value in biological tissue imaging, military anti-terrorism and optical information transmission. However, light reflected by complex scattering media, such as biological tissues, clouds and fog, multi-mode fiber, white paper and so on, will produce disorderly scattering, and then disturb the wavefront of incident light. It has always been the main obstacle to optical imaging and effective information transmission. Therefore, the control of backscattered light field is also a research field worthy of attention, which is of great significance to non-line-of-sight optical information transmission. It is also very important to find an efficient control method of backscattered light field for the breakthrough of related applications. Researchers have found that iterative wavefront shaping technology is an effective solution, which gradually modulates the amplitude or phase distribution of wavefront according to the feedback of the light intensity distribution in the target area of CCD. An improved genetic algorithm, self-adaptation genetic algorithm (SAGA), is proposed, which can be used to modulate the backscattered light field quickly. The amplitude distribution of wavefront is controlled, which make it form the required pattern at the target position through the interference of light. During the implementation of the algorithm, SAGA performs gene crossover and mutation separately, and selects gene crossover and mutation operations according to the number of iterations. At the beginning of evolution, the probability of selecting gene mutation is higher because the population needs to adapt to the environment, and at the end of evolution, it is lower because it gradually adapts to the environment. In the experimental measurement, the effective modulation area of DMD is 1024×1024, which is divided into 64×64 modulation segments by pixel merging. Each segment number is assigned a value of 0 or 1. Focusing and image projection performance of scattered light field are evaluated based on Peak-to-Background Ratio (PBR) and Pearson Correlation Coefficient (COR) respectively. Comparing the scattered light focusing and image projection by SAGA and GA, it is found that SAGA can precisely control the backscattered light field and converge to the optimal value in a few iterations. While the GA still has obvious speckle background after 1000 iterations. With the increase of iteration times, GA will also show bright focus and clear projection image. Compared with the modulation speed of GA, SAGA in light focusing and image projection is 8.3 times and 14.38 times faster respectively, which greatly improves the modulation speed of scattered light field. The fast control technology of scattered light field can develop many new applications of optical communication and provide new ideas for the research in the fields of optics and information.
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Keywords:
- Scattering medium /
- Wavefront shaping /
- Focusing /
- Image projection
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