Use of a digital grating for generating a phase shifting of pi/2, for object reconstruction.

What is it about?

The phase shifting is a widely used technique to record several holograms of a sample. Using these holograms the 3D reconstruction fo the object is achieved without noise. The most common method uses 3 or 4 steps of phase shifting and requires mechanical movements that could be inaccurate. We use a spatial light modulator to display a grating to generated two beams. A digital displacement is applied to the grating to introduce a phase shifting of pi/2 between the beams. Using only two holograms a clear reconstruction of the object is obtained.

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Why is it important?

The reconstructed object calculated with this method has a high quality. The process involves only digital changes, so it could be automatized. The method only requires two holograms and the intensities of the reference and object beams.