Optical information recording and reproducing apparatus, and...

Details Optical information recording and reproducing apparatus, and... Optical information recording and reproducing apparatus, and...

2006-11-22

2009-08-18

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07577075

ABSTRACT:
An optical information recording and reproducing apparatus, comprising: an optical system for performing recording and reproduction using holography, including a first laser source, a spatial light modulator for generating an information and reference lights which share an optical axis from a beam of the first laser source an objective lens for condensing a beam from the modulator onto a recording medium, and a light detector for receiving a reflected light from the medium; and a servo optical system for tracking a beam condensed onto the medium by the objective lens, including a second laser source wherein a beam from the second laser source is condensed onto the medium via the objective lens, a servo light detector for receiving a reflected light from the medium based on the beam of the second laser source, and a controller for controlling the first and second laser sources so that light is emitted time-divisionally.

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Tan, X. et al., “Holographic Memory/Measurement & Nano Control Technologies for Bolstering HVD™,” Proceedings of 35thMeeting on Lightwave Sensing Technology, pp. 75-82 (Jun. 2005).

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