Abstract
Optical recording has been possible for around 20 years and has led to a number of products, the best known at present being without doubt the Compact Disc digital audio system. Optical recording techniques were first applied in the LaserVision video disc system. In addition to these widespread consumer applications, optical recording is now beginning to break into areas such as the storage or distribution of digital data in computer applications. Examples are the DOR (digital optical recording) system and CD-ROM (read only memory). New products are appearing on which information can be repeatedly written, read and erased, similar to the situation in magnetic recording. All these products use the same principles of optical read-out and the required servosystems. They do differ, however, in the way in which information is recorded on the disc (the coding), in the choice of material and the structure of the optical discs.
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