Optical pick-up device having holographic element

Details Optical pick-up device having holographic element Optical pick-up device having holographic element

1988-10-19

1991-10-29

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, G11B 712

Patent

active

050620983

ABSTRACT:
An optical pick-up device includes a semiconductor laser for emitting a laser beam, a focusing lens for focusing the laser beam emitted from the laser onto the surface of an optical medium, a holographic optical element having an anisotropic refractive index and located between the laser and the focusing lens, and a photodetector for receiving a diffracted laser beam from the holographic optical element. The holographic optical element, which may be formed of a liquid crystal or a lithium niobate crystal, transmits therethrough in an undiffracted manner the laser beam emitted from the semiconductor laser and diffracts only the reflected laser beam which has reflected off of the optical medium.

REFERENCES:
patent: 4654839 (1987-03-01), Endo
patent: 4665310 (1987-05-01), Heemskerk
patent: 4728165 (1988-03-01), Powell et al.
patent: 4731772 (1988-03-01), Lee
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4794585 (1988-12-01), Lee

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