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Impact of speed, direction, and accuracy of diffractive optical element shift on efficiency of speckle suppression

机译:衍射光学元件位移的速度,方向和精度对散斑抑制效率的影响

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摘要

The impact of the precision and direction of motion of a diffractive optical element (DOE) placed inside an optical system on the efficiency of speckle suppression is analyzed. A simple model for calculating the speckle suppression efficiency in systems having a moving DOE and a random diffuser is developed. Simulation results show that at the optimal inclination angles of a regular 2D DOE and at sufficiently rapid displacement (at least N DOE periods), the speckle contrast exhibits a broad minimum. At angles that differ significantly from the optimal values, the speckle contrast varies rapidly and has peaks that exceed the minimum value by several tens of percent. For certain DOE inclination angles, the speckle contrast is several times higher than the minimum value. (C) 2015 Optical Society of America
机译:分析了放置在光学系统内部的衍射光学元件(DOE)的精度和运动方向对散斑抑制效率的影响。建立了一个简单的模型,用于计算具有移动DOE和随机扩散器的系统中的斑点抑制效率。仿真结果表明,在规则2D DOE的最佳倾斜角度和足够快速的位移(至少N个DOE周期)下,斑点对比度呈现出极小的最小值。在与最佳值明显不同的角度处,斑点对比度迅速变化,并且具有比最小值超出百分之几十的峰值。对于某些DOE倾斜角,散斑对比度比最小值高几倍。 (C)2015年美国眼镜学会

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