Magneto-optic readout using a polarization-preserving optical gu

Details Magneto-optic readout using a polarization-preserving optical gu Magneto-optic readout using a polarization-preserving optical gu

1992-02-13

1993-06-08

LaRoche, Eugene R.

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

369 13, 369110, 369112, G11B 1300, G11B 713

Patent

active

052185826

ABSTRACT:
Apparatus for reading out information magneto-optically recorded in a magnetic layer comprises a single, polarization-preserving optical guide (e.g., an optical fiber or two-dimensional waveguide) for transmitting plane-polarized read-out radiation to the recording layer, as well as for transmitting such radiation, upon being reflected by the recording layer, toward a photodetector. Either the TE or TM axis of the optical guide is initially aligned with the plane of polarization of the readout source. A polarization rotator, such as a Faraday rotator, is positioned between the output end of the optical guide and the recording medium. The Faraday rotator serves to rotate the plane of polarization of the readout radiation by a total of 45 degrees, whereby the optical guide transmits reflected light in both TE and TM modes equally. A pair of photodiodes cooperate with a polarizing beam splitter to differentially detect the Kerr rotation angles (.+-..THETA..sub.k) produced by the up/down orientation of the vertically oriented magnetic domains in the recording layer.

REFERENCES:
patent: 4626679 (1986-12-01), Kuwayama et al.
patent: 4700336 (1982-10-01), Yoshida et al.
patent: 4721368 (1988-01-01), Deguchi et al.
patent: 4729122 (1988-03-01), Itoh
patent: 4792866 (1989-01-01), Yoshikawa
patent: 4858218 (1989-08-01), Takagi et al.
patent: 4873678 (1989-10-01), Nakamura et al.
patent: 4894815 (1990-01-01), Yamanaka
patent: 4918675 (1990-04-01), Lee
IBM Technical Disclosure Bulletin vol. 33 No. 113 Jun. 1990 pp. 250-253 "Efficient M/O Read/Write Head Using Faraday Rotators".

Affiliated with

Also associated with

Rating

Magneto-optic readout using a polarization-preserving optical gu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magneto-optic readout using a polarization-preserving optical gu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-optic readout using a polarization-preserving optical gu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1947357