Binary hologram transducer using magnetic bubbles

Details Binary hologram transducer using magnetic bubbles Binary hologram transducer using magnetic bubbles

1985-03-25

1990-06-26

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Detectors

365122, 350 367, G11C 1908, G11C 1142

Patent

active

049377868

ABSTRACT:
A hologram transducer using the Faraday effect in magnetic bubble devices for recording and reproducing the amplitude and phase distributions over a section of a beam of coherent light is disclosed. The transducer spatially modulates the intensity, by using linear polarization, and the phase, by using circular polarization, of light transmitted through a magnetic bubble device. Using linear polarization and a single magnetic bubble domain to traverse in a sequence the possible storage positions in the magnetic bubble device, the transducer samples at each of these positions the intensity of the transmitted light. Using in addition a coherent reference beam of light to interfere with the light being measured, the transducer samples the phase in the half range of 0 through .pi. radians at these positions. Further, using a quarter cycle phase shift in the reference beam, the transducer resolves the phase values over the full range of 0 through 2.pi. radians. Because of the localization of the sample values by the magnetic bubbles to the order of the wavelength of the light, optical holograms may be directly recorded as electrical signals by the transducer and the corresponding images reconstructed by the transducer from the electrical signals.

REFERENCES:
patent: 3698010 (1972-10-01), Lee
patent: 3971887 (1976-07-01), Lin et al.
patent: 4229072 (1980-10-01), Torok et al.

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