High density optically encoded information storage using second

Details High density optically encoded information storage using second High density optically encoded information storage using second

1994-05-02

1996-02-20

Healy, Brian

Optical waveguides

Having nonlinear property

385141, 3461071, 359 7, 359326, 359328, G02B 610, G02B 6293

Patent

active

054936284

ABSTRACT:
Multiple bits of information are stored in the frequency domain in a bulk glass using optically encoded .chi..sup.(2) gratings. The information is read out by measuring a second harmonic generation (SHG) from the encoded glass as a function of wavelength. Information storage densities in excess of 10.sup.8 bits/cm.sup.2 are readily achievable. The stored information is stable under readout conditions, and the information can be erased and rewritten.

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