Optical head apparatus and diffraction element having at least t

Details Optical head apparatus and diffraction element having at least t Optical head apparatus and diffraction element having at least t

1994-11-08

1997-05-06

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369103, 369109, 369110, 359485, 359494, G02B 612

Patent

active

056278128

ABSTRACT:
The light reading the information of an optomagnetic disk is focused by a detector lens 104, and is put into a polarizing hologram 121 and a polarizing hologram 122 composed of lithium niobate. These polarizing holograms have action to separate a polarized light component in the z-axis direction and a polarized light component orthogonal thereto into transmitted light and diffracted light. The polarizing and separating hologram 121 is installed so that its z-axis may have an inclination of 45 degrees to the principal direction of polarization of incident light, and the z-axis of the polarizing and separating hologram 122 is set in a direction orthogonal thereto. Therefore the individual polarizing holograms transform different polarized light components into different wave planes. Accordingly, in a photo detector 196, TE signal and TM signal are obtained in different polarized light components, so that the imbalance of the head amplifiers can be eliminated.

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