Noise elimination technique in holography

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Abstract
A method has been described for reducing speckling and the noise arising due to cosmetic defects present in the elements of the hologram recording geometry by using a multifrequency grating–diffuser–lens combination for object illumination at the time of recording the hologram. The averaging of the speckling is simulated at the plane of the object. The experimental results show that this method of object illumination is quite effective for noise reduction and may be applied to recording noise-free holograms of shortlived events. It may also be useful in holographic microscopy.