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Appl Opt. 2008 Apr 20;47(12):2076-81.

Spatial amplitude and phase modulation using commercial twisted nematic LCDs.

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Complex Photonic Systerms, Faculty of Sciences and Technology and MESA+ Institute for Nanotechnology, University of Twente, AE Enschede, The Netherlands.


We present a method for full spatial phase and amplitude control of a laser beam using a twisted nematic LCD combined with a spatial filter. By spatial filtering we combine four neighboring pixels into one superpixel. At each superpixel we are able to independently modulate the phase and the amplitude of light. We experimentally demonstrate the independent phase and amplitude modulation using this novel technique. Our technique does not impose special requirements on the spatial light modulator and allows precise control of fields even with imperfect modulators.


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