We present real-time optical preprocessor intended to enhance small defects in a smooth
surface. The heart of the system is a photorefractive Bi_12SiO_20 phase-conjugate mirror …

We have built an adaptive system capable of detecting submicrometer defects in periodic
structures by using real-time holography in photorefractive crystals. We summarize the …

We present a defect-enhancement system capable of detecting submicrometer defects on
opaque periodic structures using real-time holography in photorefractive crystals. We detect …

This report proposes a method for measuring object phase changes in real time. This new
method utilises photorefractive holographic interferometry to form a hologram that contains …

The first known experimental results of real-time optical defect enhancement of a periodic
mask are reported. A low-intensity reference wave interferes with the Fourier transform of an …

A method of optical image subtraction is proposed. It provides parallel and real-time
amplitude subtraction of two images by using holographic interference in photorefractive …

The purpose of this work is to study the potentialities of phase-shifting real-time holographic
interferometry for the analysis of light-induced lens in photorefractive and nonlinear optical …

The structure and operation of a holographic interferometer that uses photorefractive
Bi12TiO20 crystals as reusable recording materials and computer image processing for …

Any change in physical quantities like density and temperature, affect the refractive index
distribution of materials. So, any discontinuity in the translucent materials can be imaged or …

We present a real-time holographic interferometer using sillenite crystals for measurement of
deformations of large diffusive objects. Two kinds of optical heads have been investigated: a …