Holographic memory optical system based on computer-generated Fourier holograms

2013 ◽  
Vol 52 (33) ◽  
pp. 8142 ◽  
Author(s):  
A. Yu. Betin ◽  
V. I. Bobrinev ◽  
S. B. Odinokov ◽  
N. N. Evtikhiev ◽  
R. S. Starikov ◽  
...  
Keyword(s):  
Optical System ◽  
Holographic Memory

scholarly journals Method of computer generation of Fourier microholograms and optical system of their record on a holographic memory disk

2013 ◽  
Author(s):  
С.Б. Одиноков ◽  
◽  
Н.М. Вереникина ◽  
А.С. Подгородняя ◽  
С.С. Донченко ◽  
...  
Keyword(s):  
Optical System ◽  
Holographic Memory ◽  
Computer Generation

Fractional Fourier domain encrypted holographic memory by use of an anamorphic optical system

2001 ◽  
Vol 40 (2) ◽  
pp. 299 ◽  
Author(s):  
Gopinathan Unnikrishnan ◽  
Joby Joseph ◽  
Kehar Singh
Keyword(s):  
Optical System ◽  
Fourier Domain ◽  
Holographic Memory

Research of a method and optical system for recording multiplex holograms in a system of holographic memory

2009 ◽  
Author(s):  
Sergey B. Odinokov ◽  
Evgeny A. Usovich ◽  
Nina M. Verenikina ◽  
Vladimir V. Markin ◽  
Anton S. Goncharov ◽  
...  
Keyword(s):  
Optical System ◽  
Holographic Memory

Optical system of holographic memory card writing/reading equipment

2000 ◽  
Author(s):  
Gabor Erdei ◽  
Gabor Szarvas ◽  
Emoeke Loerincz ◽  
Jozsua Fodor ◽  
Ferenc Ujhelyi ◽  
...  
Keyword(s):  
Optical System ◽  
Holographic Memory ◽  
Memory Card

A New Optical System for Holographic Memory Applying a Finite Objective Lens

2008 ◽  
Vol 47 (7) ◽  
pp. 5915-5917
Author(s):  
Yuzuru Yamakage ◽  
Kazushi Uno ◽  
Yasumasa Iwamura ◽  
Satoshi Shimokawa ◽  
Hiroyasu Yoshikawa ◽  
...  
Keyword(s):  
Optical System ◽  
Objective Lens ◽  
Holographic Memory

A Field Emission System For Transmission Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 298-299
Author(s):  
Michel Troyonal ◽  
Huei Pei Kuoal ◽  
Benjamin M. Siegelal
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Optical System ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Objective Lens ◽  
Electron Optical System ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Emission System

A field emission system for our experimental ultra high vacuum electron microscope has been designed, constructed and tested. The electron optical system is based on the prototype whose performance has already been reported. A cross-sectional schematic illustrating the field emission source, preaccelerator lens and accelerator is given in Fig. 1. This field emission system is designed to be used with an electron microscope operated at 100-150kV in the conventional transmission mode. The electron optical system used to control the imaging of the field emission beam on the specimen consists of a weak condenser lens and the pre-field of a strong objective lens. The pre-accelerator lens is an einzel lens and is operated together with the accelerator in the constant angular magnification mode (CAM).

Information and estimation in image processing

1987 ◽  
Vol 45 ◽  
pp. 14-17
Author(s):  
B. Roy Frieden
Keyword(s):  
Image Processing ◽  
Optical System ◽  
Large Amplitude ◽  
Communication Theory ◽  
Image Data ◽  
Direct Approach ◽  
Ill Posed

Despite the skill and determination of electro-optical system designers, the images acquired using their best designs often suffer from blur and noise. The aim of an “image enhancer” such as myself is to improve these poor images, usually by digital means, such that they better resemble the true, “optical object,” input to the system. This problem is notoriously “ill-posed,” i.e. any direct approach at inversion of the image data suffers strongly from the presence of even a small amount of noise in the data. In fact, the fluctuations engendered in neighboring output values tend to be strongly negative-correlated, so that the output spatially oscillates up and down, with large amplitude, about the true object. What can be done about this situation? As we shall see, various concepts taken from statistical communication theory have proven to be of real use in attacking this problem. We offer below a brief summary of these concepts.

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