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 …

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 …

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 …

Photorefractive materials offer important advantages in many optical holography
applications, but the recorded images typically remain sensitive to light and therefore erase …

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 for simultaneous recording and readout of volume holograms in cubic
photorefractive crystals based on the phenomenon of anisotropic diffraction is suggested. A …

Several methods are investigated to avoid undesired erasure during read-out of volume
phase holograms stored in photorefractive crystals. We present results on thermal fixing and …

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 …

We describe a method to create and reconstruct computer-generated Fourier-transform
holograms in photorefractive materials. Holographic reconstructions are obtained from …