期刊
OPTICS EXPRESS
卷 22, 期 15, 页码 17999-18009出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.017999
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资金
- European Research Council [279248]
We present a superpixel method for full spatial phase and amplitude control of a light beam using a digital micromirror device (DMD) combined with a spatial filter. We combine square regions of nearby micromirrors into superpixels by low pass filtering in a Fourier plane of the DMD. At each superpixel we are able to independently modulate the phase and the amplitude of light, while retaining a high resolution and the very high speed of a DMD. The method achieves a measured fidelity F = 0.98 for a target field with fully independent phase and amplitude at a resolution of 8 x 8 pixels per diffraction limited spot. For the LG(10) orbital angular momentum mode the calculated fidelity is F = 0.99993, using 768 x 768 DMD pixels. The superpixel method reduces the errors when compared to the state of the art Lee holography method for these test fields by 50% and 18%, with a comparable light efficiency of around 5%. Our control software is publicly available. (C) 2014 Optical Society of America
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