Integrated optical read/write head and apparatus incorporating same

Apparatus for writing and/or reading information on a recording element comprises an integrated optical write/read head of the type comprising a planar optical waveguide and means for deflecting a guided beam of radiation out of the waveguide at an egress zone and for bringing such beam to a focused...

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Bibliographic Details
Main Author REVELLI; JOSEPH F
Format Patent
LanguageEnglish
Published 31.01.1989
Edition4
Subjects
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
FREQUENCY-CHANGING
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Summary:Apparatus for writing and/or reading information on a recording element comprises an integrated optical write/read head of the type comprising a planar optical waveguide and means for deflecting a guided beam of radiation out of the waveguide at an egress zone and for bringing such beam to a focused spot on a desired data track on the recording element. Means, responsive to any displacement of such focused spot from a desired data track, is provided for selectively varying the effective refractive index of the waveguide in the vicinity of the egress zone in order to vary the tracking position of the spot. Such means comprises a pair of spaced parallel electrodes in close proximity to the egress zone, and means for producing an electric field between such electrodes, such field varying with the tracking error.
Bibliography:Application Number: US19870062524