The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 2005
Filed:
Aug. 07, 2001
Tsuen-hsi Liu, Calabasas, CA (US);
Demetri Psaltis, Pasadena, CA (US);
Fai H. Mok, Torrance, CA (US);
Gan Zhou, Pasadena, CA (US);
Tsuen-Hsi Liu, Calabasas, CA (US);
Demetri Psaltis, Pasadena, CA (US);
Fai H. Mok, Torrance, CA (US);
Gan Zhou, Pasadena, CA (US);
California Institute of Technology, Pasadena, CA (US);
Abstract
An optical memory for storing and/or reading data on an optical disk. The optical disk incorporates a material in which holographic gratings can be created, and subsequently detected, at plural locations within the disk by an electro-optical head. Creation and detection of holographic gratings with variable diffraction efficiency is possible with the electro-optical head. Multiple holographic gratings can also be created at each one of the plural locations via a beam of light which has a different wavelength or point of focus. These data elements can be read by the electro-optical head using a beam of light sequentially varied in wavelength or point of focus to correspond to the multiple holographic gratings to be recorded.