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Three-dimensional monochromatic light field synthesis with a deflectable mirror array device

机译:可偏转镜阵列器件的三维单色光场合成

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摘要

We investigated the problem of complex scalar monochromatic light field synthesis with a deflectable mirror array device (DMAD). First, an analysis of the diffraction field produced by the device upon certain configurations is given assuming Fresnel diffraction. Specifically, we derived expressions for the diffraction field given the parameters of the illumination wave and the tilt angles of the mirrors. The results of the analysis are used in later stages of the work to compute the samples of light fields produced by mirrors at certain points in space. Second, the light field synthesis problem is formulated as a linear constrained optimization problem assuming that mirrors of the DMAD can be tilted among a finite number of different tilt angles. The formulation is initially developed in the analog domain. Transformation to digital domain is carried out assuming that desired fields are originating from spatially bounded objects. In particular, we arrived at a Dp = b type of problem with some constraints on p, where D and b are known, and p will be solved for and will determine the configuration of the device. This final form is directly amenable to digital processing. Finally, we adapt and apply matching pursuit and simulated annealing algorithms to this digital problem. Simulations are carried out to illustrate the results. Simulated annealing performs successful synthesis when supplied with good initial conditions. However, we should come up with systematic approaches for providing good initial conditions to the algorithm. We do not have an appropriate strategy currently. Our results also suggest that simulated annealing achieves better results than MP. However, if only a part of the mirrors can be used, and the rest can be turned off, the performance of MP is acceptable and it turns out to be stable for different types of fields.
机译:我们研究了带有可偏转镜阵列器件(DMAD)的复杂标量单色光场合成问题。首先,假设菲涅耳衍射,给出了在特定配置下由该装置产生的衍射场的分析。具体来说,我们在给定照明波参数和反射镜倾斜角的情况下,得出了衍射场的表达式。分析的结果将在以后的工作中使用,以计算由反射镜在空间中某些位置产生的光场样本。其次,假设DMAD的反射镜可以在有限数量的不同倾斜角度之间倾斜,则将光场合成问题公式化为线性约束优化问题。该制剂最初在模拟域中开发。假定期望的场源自空间上有界的对象,就可以进行向数字域的转换。特别是,我们得出了Dp = b类型的问题,对p有一些约束,其中D和b是已知的,将解决p并确定设备的配置。此最终形式直接适用于数字处理。最后,我们将匹配追踪和模拟退火算法改编并应用于该数字问题。进行仿真以说明结果。当提供良好的初始条件时,模拟退火可以成功完成合成。但是,我们应该想出系统的方法来为算法提供良好的初始条件。我们目前没有合适的策略。我们的结果还表明,模拟退火比MP可获得更好的结果。但是,如果只能使用一部分反射镜,而其余的可以关闭,则MP的性能是可以接受的,并且对于不同类型的场而言,它是稳定的。

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