Accession Number : AD0740323

Title :   High Density Optical Memory.

Descriptive Note : Quarterly progress rept. Jan-Mar 72,

Corporate Author : ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB

Personal Author(s) : Knoebel,H. W. ; Krone,H. V.

Report Date : APR 1972

Pagination or Media Count : 5

Abstract : The Progress Report for last quarter contained a discussion of the problem of scattered light and the measurements that were being carried out on the experimental memory system to determine writing efficiency over a large range of writing light intensity. Measurements have been completed for KCl over an intensity range of approximately 10,000. The measurements show that the intensity-time product of the writing light has to be greater by approximately a factor of ten at the lowest light level in order to accomplish identical exposures (or density) on the KCl crystal. This kind of response will help minimize the problem of scattered light and indicates that storage of 1 million bits per crystal is feasable. It would be desirable to extend this data over a larger range of writing light intensity by making measurements at lower light levels. A plot of the data taken is included with this report.

Descriptors :   (*MEMORY DEVICES, PHOTOCHROMISM), POTASSIUM COMPOUNDS, CHLORIDES, INTENSITY, SCATTERING, LASERS, ULTRAVIOLET RADIATION

Subject Categories : Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE