Nano-scale resolution optical pickup for reading/writing...

Details Nano-scale resolution optical pickup for reading/writing... Nano-scale resolution optical pickup for reading/writing...

2006-06-27

2006-06-27

Nguyen, Hoa T. (Department: 2656)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112020, C369S095000

Reexamination Certificate

active

07068583

ABSTRACT:
A single high resolution holographic pickup, for reading/writing both a CD and DVD optical recording medium, has an electrical tuning control for applying a DC and AC signal to a tunable Bragg cell, which AC is phase locked with respect to the fundamental repetition frequency of the recorded data on the CD to produce accurate tracking. A special high resolution holographic lens is recorded within the Bragg cell that focuses the light signals read off of the optical storage mediums upon a pickup detector, and its focal length is varied to read a selected CD and or DVD from a group of CDs or DVDs in response to changes in the DC applied to the Bragg cell. The holographic lens within the Bragg cell is formed by an interference pattern produced by interfering light emitted from the tip of a one micron optical fiber and a plane broad light beam.

REFERENCES:
patent: 5422873 (1995-06-01), Kewitsch et al.
patent: 5532998 (1996-07-01), Durham
patent: 5835458 (1998-11-01), Bischel et al.
patent: 6363046 (2002-03-01), Yoo et al.
patent: 6577417 (2003-06-01), Khoury

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