NOISE GRATINGS IN THICK-PHASE HOLOGRAPHIC LENSES

An experimental analysis of noise gratings in holographic lenses is pr esented. Lenses are recorded as thick-phase holograms in bleached silv er halide emulsion. We calculated noise grating efficiency by using th e diffraction efficiency in points across a lens diameter. We show tha t due to presence of noise gratings, it is necessary to change the rea dout geometry of lenses with respect to the recording geometry in orde r to achieve maximum diffraction efficiency. This change gives rise to aberrations. The root mean square of the wavefront aberration on the entire surface of the lens is calculated for the holographic lens anal yzed experimentally.