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Browse Prior Art Database

Waveguide Electro-optic Deflector for Optical Storage

IP.com Disclosure Number: IPCOM000122030D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Bjorklund, GC: AUTHOR

Abstract

Disclosed is a device for producing a movable virtual laser spot source with adjustable eccentricity suitable for laser disk optical storage applications such as low frequency track selection and high frequency track following. The device is monolithic, has no moving parts, and uses the electro-optic effect to achieve voltage-controlled lateral displacement of the virtual laser spot source.

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Waveguide Electro-optic Deflector for Optical Storage

      Disclosed is a device for producing a movable virtual
laser spot source with adjustable eccentricity suitable for laser
disk optical storage applications such as low frequency track
selection and high frequency track following.  The device is
monolithic, has no moving parts, and uses the electro-optic effect to
achieve voltage-controlled lateral displacement of the virtual laser
spot source.

      As shown in the figure, the device consists of a substrate onto
which is deposited a conducting bottom electrode, a bottom dielectric
layer, an electro-optically active waveguiding layer, a top
dielectric layer, and a top conducting electrode.  The preferred
material for the electro-optically active waveguiding layer is an
electro-optic polymer poled in the direction normal to the surface of
the substrate, but epitaxially grown organic or inorganic crystals
could also be used.  The waveguiding layer and/or top buffer layer
can be laterally patterned using known techniques of integrated
optics to produce waveguide lenses [1].  In addition, it is assumed
that the waveguiding layer and/or the top electrode layer can be
laterally patterned to produce a waveguide multiple prism
electro-optic angular deflector [2].

      A standard optical storage-type diode laser source is
butt-coupled to inject light into the active waveguiding layer.  The
laterally diverging light is collimated by the first waveguide lens,...