Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1992-07-27
1994-09-20
Bertsch, Richard A.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369110, G11B 1304
Patent
active
053495764
ABSTRACT:
Apparatus and method for determining an orientation of magnetic domains currently being irradiated by a laser having two orthogonal linearly polarized modes of operation is described. The orientation of the currently irradiated magnetic domains determines which linear polarization mode is currently active and can be used as a readout technique for signals encoded in a magneto-optic medium. This polarization switching technique for the reading stored information is dependent on adjusting the parameters of the extended laser cavity so that excitation of each polarization mode is substantially equally probable. When the parameters of the extended laser cavity are substantially equally probable, then the difference in the attenuation of circularly polarized radiation resulting from interaction with oppositely oriented magnetic domains in a magneto-optic material determine the current polarization mode. To equalize probability for laser excitation in either orthogonal mode, the extended cavity is structured to include regions wherein only one linear polarization mode is present. In the single mode region, the attenuation of associated linearly polarized laser radiation mode can be separately controlled and the presence of laser activity in the associated mode can be easily determined.
REFERENCES:
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4571650 (1986-02-01), Ojima et al.
patent: 4955006 (1990-09-01), Fukushima et al.
patent: 4959821 (1990-09-01), Morimoto et al.
patent: 5105399 (1992-04-01), Shimonou
patent: 5148422 (1992-09-01), Sako et al.
patent: 5182735 (1993-01-01), Kurtz et al.
patent: 5235570 (1993-08-01), Kurtz et al.
Bertsch Richard A.
Eastman Kodak Company
McAndrews, Jr. Roland G.
Owens Raymond L.
LandOfFree
Apparatus and method for polarization switching of a readout bea does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for polarization switching of a readout bea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for polarization switching of a readout bea will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2430499