Static information storage and retrieval – Radiant energy – Color centers
Patent
1992-06-23
1994-03-22
LaRoche, Eugene R.
Static information storage and retrieval
Radiant energy
Color centers
365106, 365215, G11C 1304
Patent
active
052970760
ABSTRACT:
Phase modulation is used to record data in a spectral hole burning material. A laser and a phase modulator are used to generate both a reference pulse and a phase modulated data pulse to the material. The data is recorded as spectral holes in the absorption spectrum of the material. In order to read the data, a second reference pulse is generated which creates an echo pulse from the material. This echo pulse is combined with a frequency shifted comparator pulse in order to generate a heterodyne signal. A phase sensitive demodulator detects the phase transitions in the heterodyne signal and generates a digital signal representative of the data recorded.
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Jefferson Carl M.
Meixner Alfred J.
International Business Machines - Corporation
LaRoche Eugene R.
Millett Douglas R.
Yoo Do Hyun
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