The paper describes the stabilizing effect of random phase diffuser applied at recording or synthesis of Fourier hologram.
The stabilizing effect is meant here as ability to keep quality of the image formed by Fourier hologram or kinoform in
terms of preserving the main structure of intensity distribution under wavefront distortions of different scale in restoring
beam. A theoretical explanation to the effect is given as converting of convolution of ideal image with hardware function
of the system from coherent to non-coherent. Demonstrated are the results of computational and real experiments with
synthesized Fourier hologram and SLM device. A test random wavefront distortion is taken for the experiments.
Stabilization is demonstrated for the scale of distortion as large as approximately 5π of amplitude.
In the paper described is a method of transmission of phase information by an optical signal which propagates through an optically inhomogeneous medium. Phase information is represented as an interference pattern of two states of an object that is deformed between state fixations. It is proposed to pass signal and reference beams through an optically inhomogeneous path in the same direction when recording holograms of states. In this implementation, an optical signal which carries information in the form of a system of interfering beams (holograms) is subject to minimal interference. And these holograms contain undistorted information about the wavefronts of the beams. Further mathematical processing (image addition and noise separation) allows to obtain the desired information about the deformation of the object. Optical inhomogeneities in the work are represented in thin diffuser approximation (Random Phase Diffuser), where RPD is described as an ensemble of point retranslates. Each of these retranslates at any point of the cross section of the beam transmit the amplitude of the field and at the same time adds a random stationary change to the phase. This model of optical inhomogeneities is of practical interest, because such a representation corresponds to the description of a single-mode regular fiber bundle, which can be used in real experiments to obtain information about the state of the object from hard-to-reach places.
In the paper investigated are optically inhomogeneous objects using holographic interferometry, speckle-interferometry and optical correlation. A non-interferometricshift of interference fringes is observed. Shown is that the shift is related to the statistical distribution that describes the optical inhomogeneity of the objects of study.
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