Method for rewriting data in three-dimensional optical...

Details Method for rewriting data in three-dimensional optical... Method for rewriting data in three-dimensional optical...

2005-05-24

2005-05-24

Wong, Don (Department: 2821)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

Reexamination Certificate

active

06897433

ABSTRACT:
A method for rewriting data in a three-dimensional optical memory element created in glass with ultrashort light pulse includes creating a bit due to a photo-induced contrast in index of refraction inside the glass in three dimensions depending of the strength of a first ultrashort-pulse laser beam. Then, irradiating the bit created in three dimensions with a second ultrashort-pulse laser beam having a lower energy than the strength of the first ultrashort-pulse laser beam while condensing the second ultrashort-pulse laser beam with an optical lens at a point shifted from the bit to be moved by a predetermined distance in an opposite direction from the direction of propagation of the first and second ultrashort pulse laser beams, thereby moving the bit for rewriting.

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patent: 11-232706 (1999-08-01), None
E.N. Glezer et al.: “3-D optical storage inside transparent materials” Optics Letters, vol. 21, No. 24, pp. 2023-2025 1996.
Hong-Bo Sun et al.: “Microfabrication and characteristics of two-dimensional photonic crystal structures in vitreous silica” Optical Review, vol. 6, No. 5, pp. 396-398 1999.

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