Abstract
Any memory that is written and read optically is called an “optical memory”. The optical memory is generally characterized by its very high recording density and its capability of processing information en bloc. Laser beams are usually used as the light source. An optical disk is one such information recording device that uses a laser. Here information is recorded by making pits 1 µm or less in diameter in a recording disk with a laser beam and is read by irradiating the beams onto a video or audio disk. Since optical recording enables the light to be squeezed to near its own wavelength, recording densities of 108 bits/cm2 can be expected in theory.
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