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调控经散射介质散射后的光场在生物组织成像、军事反恐和光信息传输等领域具有潜在的应用价值。然而，经散射介质反射后的光子传播方向变得无序，导致携带光信息的波前被扰乱。将一种新的波前振幅调制方法——自适应遗传算法（self-adaption genetic algorithm,SAGA）引入到背向散射光场调控中。根据环境变化，种群自适应的选择基因的突变或交叉，极大提高了寻找最优解的收敛速度。通过实验研究验证了SAGA在背向散射光场调控方面的有效性，并表明相较于遗传算法（genetic algorithm,GA），SAGA在调控速度和抗噪声方面都存在明显优势。研究结果表明SAGA在较少的迭代次数内即可获得高对比度的光聚焦和图像投影，并收敛于最优解。相较于GA，其在进行散射聚焦和图像投影时的调控速度分别快8.3倍和14.38倍。这种快速的散射光场调控技术为光信息传输领域的研究提供了新思路，具有广泛的应用潜力。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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