Optical Methods of Information Storage

  • M. Hartmann
  • A. M. L. Spruijt
  • B. A. J. Jacobs
Conference paper


The application of a focussed, scanning laser beam for data storage and retrieval is referred to as optical recording. The concept of this ‘bit- oriented’ optical storage has been under development since the early seventies. The Laser Vision video-disk system (1) as well as the more recently introduced digital audio-disks (2) offer areal information densities up to about 100 Mbit/cm2, one to two orders of magnitude higher than in magnetic recording media. Both are playback (read-only) systems, offering combined video and audio and high-quality audio, respectively. One major advantage of the optical disk is its contactless read-out. A laser is focussed into a small spot (full width half maximum 0.8 (µm) on the disk, thus reading the information. The distance between the objective lens and the information carrying layer is several millimeters; this allows for a transparent substrate of approximately 1 mm thickness to be situated between the storage layer and the reading head. The information layer is located inside a substrate sandwich. Small scratches or dust do not affect the reading quality, since the outer surface is out of focus.


Full Width Half Maximum Compact Disk Optical Recording Optical Storage Laser Vision 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin, Heidelberg 1986

Authors and Affiliations

  • M. Hartmann
    • 1
  • A. M. L. Spruijt
    • 2
  • B. A. J. Jacobs
    • 3
  1. 1.Philips GmbH Forschungslaboratorium HamburgHamburg 54Germany
  2. 2.Philips Optical Media Development SPG EindhovenThe Netherlands
  3. 3.Philips Research Laboratory EindhovenThe Netherlands

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