READ/WRITE/ERASE MEMORY SYSTEMS FROM COMPOSITES GRAFT POLYMERS

HIGH MEMORY STORAGE CAPACITY, INHERENT IN OPTICAL RECORDING SYSTEMS, HAS ASSISTED IN THE VERY BROAD APPLICATIONS OF OPTICAL DISKS FOR STORAGE OF COMPUTER, SATELLITE, X-RAY, ANDSTATISTICAL DATA AND VIDEO PICTURES. A NEW OPTICAL RECORDING SYSTEM (ORS), BASED ON POLYVINYL ALCOHOL-N-METHYL ACRYLAMIDE, DEMONSTRATES SUPERIOR OPTICAL PROPERTIES WHEN COMPARED TO EXISTING OPTICAL SYSTEMS. WITH THIS NEW SYSTEM, A READ/WRITE/ERASABLE OPTICAL DISK STORAGE SYSTEM WILL BE DEMONSTRATED BY APPLYING REAL TIME BIREFRINGENT VOLUME HOLOGRAMS HAVING HIGHER RESOLUTION, SENSITIVITY, AND DIFFRACTION EFFICIENCY THAN PREVIOUSLY THOUGHT POSSIBLE. THUS, DIFFERENCES WITHIN THE ORDINARY AND EXTRAORDINARY INDICES OF AS MUCH AS 0.01 CAN BE ACHIEVED BY HOLOGRAPHIC EXPOSURE WITH ARGON LASER LIGHT WITH VERY LOW EXPOSURE OF 10 MJ/CM(2). AN INNOVA LASER GIVES A TOTAL CONTINUOUS POWER OF 10 W, AND THUS IT IS POSSIBLE TO OBTAIN A RESPONSE TIME OF 1 MUS. LONG TIME RETENTION FIXING COULD BE ACHIEVED BY HEATING, WHEREAS ERASING CAN BE OBTAINED BY A HIGHLY UNIFORM LASER EXPOSURE.