By V. A. Arbuzov, V. A. Fedorov (auth.), Yu. E. Nesterikhin, George W. Stroke, Winston E. Kock (eds.)
This quantity includes the full set of papers offered on the First U. S. -U. S. S. R. Sciences Cooperation Seminar on "Optical info Processing" held on the U. S. nationwide Academy of Sciences in Washington, D. C. from sixteen - 20 June 1975 less than the sponsorship of the nationwide technological know-how starting place in cooperation with the U. S. S. R. Academy of Sciences. The papers current the most recent theoretical advances and ex perimental cutting-edge within the newly constructing box of "opti cal details processing", with specific emphasis on appli cations to conversation, info garage and processing. electronic in addition to optical platforms are mentioned by way of ideas and implementations. incorporated are coherent and inco herent optical processing platforms (for photos and signals), fabrics and units for optical computing, acousto-optic sign processing, stories (optical, electronic and holographic), optical good judgment and optically-accessed electronic shops, non-linear optical processing, in addition to an research of the knowledge potential of optical processing structures and a document on new ex tensions of data processing in man made aperture radar. designated configurations and new production options for numerous parts are awarded, together with such subject matters as "asymmetric interference fringes in mirrored gentle" and' kino shape optical components" of very top of the range; those are section plates having a gently managed thickness, a bit of com parable to the well-known Schmidt plates and which can have a huge position in lots of optical laptop and communications systems.
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Extra info for Optical Information Processing
The structure of an optically addressed DKDP device  is shown in Fig. 9a. A Se photoconductor and 170 ~m DKDP crystal are used. Voltage applied between the electrodes divides between the PC and DKDP, most across the PC. When exposed to write light, charges are created and drift to the crystal-PC interface, causing a field to develop across the crystal (30 ~sec write time). Readout is in reflection by the Pockels effect. When the applied voltage is reduced to zero and the PC is flooded, the trapped charge migrates (3000 ~sec erase) to the electrodes and the device is erased.
COHERENT OPTICAL COMPUTING 33 Another recent development  has overcome an objection common to many OALMs: the necessity for two different wavelengths of light for writing and reading. In coherent optical processing, this causes considerable difficulty. We have recently demonstrated a technique for writing NaF where only one wavelength of coherent light is needed. This is of extreme importance in holographic recording and correlation. By simultaneously illuminating the sample with broadband radiation from a Hg arc lamp and a coherent 508 nm Argon laser (with the input data placed in the Argon beam), the ionization of M centers can be inhibited in those regions of the sample illuminated by both beams (bright areas of the image).
Erasure is by thermal (300°C) or optical excitation. Stored images must be fixed or they will be erased after repeated readout (10-20 reads in LiNb0 3 ). Undoped LiNb03 can be fixed by heating to 1000e for 30 min, cooling, and reexposing. LiNb0 3 :Fe can be fixed by recording (20 sec-2 min) on it at elevated temperatures (150°C) and cooling it before heating for another exposure. 5 sec after recording . Sensitivity has been a problem in these materials. Remarkable progress  has been made in iron doped LiNb0 3 .