Accession Number:

ADA413850

Title:

Multi-Layer Worm Disk with Parallel Recording and Read-Out for High Capacity Storage

Descriptive Note:

Final rept. Aug 1998-Jan 2003

Corporate Author:

CALL RECALL INC SAN DIEGO CA

Report Date:

2003-04-01

Pagination or Media Count:

81.0

Abstract:

Technology has been developed to enable recording and reading of optical disks having many layers. The approach selected relies on recording bits in a volume by using single beam two-photon recording. A volumetric bit is written in the volume of a molded photochromic dispersed organic polymer only at spatial locations where the recording beam has sufficient photon energy. Data recording is based on two-photon absorption, by which one molecule is excited into a higher state by absorbing the combined energy of two photons. Under this program, the following key sub-system components were developed a Materials with high sensitivity and transparency that can be fabricated into a disk form. b Recording and read-out heads that are capable of parallel operation while minimizing interlayer cross-talk. c Focus and tracking servo systems that position the heads over the desired data track and layer.

Subject Categories:

  • Recording and Playback Devices
  • Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE