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:
Nov. 20, 2012
Filed:
Dec. 29, 2010
Zhiyuan Ren, Malta, NY (US);
Xiaolei Shi, Niskayuna, NY (US);
Victor Petrovich Ostroverkhov, Ballston Lake, NY (US);
Xuefeng Wang, Schenectady, NY (US);
Zhiyuan Ren, Malta, NY (US);
Xiaolei Shi, Niskayuna, NY (US);
Victor Petrovich Ostroverkhov, Ballston Lake, NY (US);
Xuefeng Wang, Schenectady, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Methods and systems are provided for recording micro-holograms in a holographic disk. Disk tilting or disk imperfections may cause counter-propagating recording and reference beams to deviate from the target data position in the disk. In some embodiments, a tracking beam is directed to a tracking position in the disk, and deviation of the tracking beam from the tracking position may indicate tracking and/or focusing errors of the recording and/or reference beams. A detector may generate an error signal in response to such errors. A first servo-mechanical system may actuate a first optical head (e.g., transmitting the reference and tracking beams) to compensate for such errors, and a second servo-mechanical system may actuate a second optical head (e.g., transmitting the recording beam) to follow the actuation of the first servo system, such that an interference of the reference beam and the recording beam may be maintained in the target data position.