The holographic projection technique has the merits of being aberration-free, producing high contrast images, having ability of color reconstruction with one spatial light modulator, and so on. We propose a zoomable holographic projection technique without using a zoom lens and verify the method using numerical simulation. The method can reconstruct any zoom-in and zoom-out image between the Oth and 1st order diffraction lights, and the processing time for the zoom is constant.
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