The effects of the space–bandwidth product on the phase modulation magnitude are our main topic of investigation here. The large phase modulation produced with the liquid-crystal display (LCD) is realized with the kinoform method. One model is established in order to analyze the effects of the space–bandwidth product. The maximum phase change is drastically increased while the pixel size is less than 50 µm or so. But the effect of the area is almost linear with the maximum phase change. Then the experiments are completed for the purpose of verifying the theoretical analysis. We achieve a phase change of 2.05λ (λ=633 nm), which is half of the calculated value in a 1cm×1cm area, as it is affected by the cross talk and the pixel shape.
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