Magnetooptic apparatus with integrated detecting element providi

Details Magnetooptic apparatus with integrated detecting element providi Magnetooptic apparatus with integrated detecting element providi

1993-09-27

1995-11-28

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 369112, 385 28, 385 14, 385 43, G11B 1100, G11B 700

Patent

active

054714400

ABSTRACT:
In an apparatus for recording and reading out magnetooptic information an incident light beam polarized in a predetermined direction is modulated by rotating a plane of polarization in accordance with a recording pattern of a magnetooptic information recording medium utilizing magnetooptic Kerr effects. The modulated light beam is detected by a detecting system integrated element to read the recording pattern. The magnetooptic information recording-reading out apparatus has a TE/TM mode separating element of a waveguide type for separating lights in TE and TM modes from each other and disposed in the detecting system integrated element; a waveguide photodetector for detecting light in the TE mode and disposed in the detecting system integrated element; a waveguide photodetector for detecting light in the TM mode and disposed in the detecting system integrated element; and a signal detector for setting outputs I.sub.TE and I.sub.TM of the waveguide photodetectors for detecting lights in the TE and TM modes to be approximately equal to each other.

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Kobayashi et al., "An Optical Waveguide TE-TM Mode Splitter" Appl. Physics Letter vol. 32, No. 5, Mar. 1, 1978, pp. 300-302.

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