Accession Number : AD0721685

Title :   Three-Dimensional Information Storage in Alkali Halides by Two-Photon Absorption.

Descriptive Note : Research and development rept. Mar 68-Mar 69,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Geller,M. ; Taylor,H. F.

Report Date : 04 JAN 1971

Pagination or Media Count : 29

Abstract : Color centers can be produced in alkali halide crystals by two-photon absorption from an ultraviolet laser beam. Because the two-photon effect is a quadratic function of power density, a colored spot can be produced anywhere in the crystal by a sharply focused beam. This provides a means of storing binary information, which can be read by measuring the interaction of a focused laser beam with the color centers. A storage capacity of 5 x 10 to the 10th power bits/cc and reading and writing rates of 40 MHz are estimated for KBr. (Author)

Descriptors :   (*ELECTROOPTICS, HALIDES), (*DATA STORAGE SYSTEMS, FEASIBILITY STUDIES), COLOR CENTERS, MONOCHROMATIC LIGHT, ULTRAVIOLET RADIATION, POTASSIUM COMPOUNDS, BROMIDES, LASERS

Subject Categories : Computer Hardware
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE