Browse Prior Art Database

Nonmechanical Optical Access to X-Y Data Fields

IP.com Disclosure Number: IPCOM000104732D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 1 page(s) / 30K

Publishing Venue

IBM

Related People

Sincerbox, GT: AUTHOR

Abstract

Disclosed is a nonmechanical means for deflecting a beam of light over a two-dimensional field of view by utilizing a hologram and a variable wavelength source of radiation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Nonmechanical Optical Access to X-Y Data Fields

      Disclosed is a nonmechanical means for deflecting a beam of
light over a two-dimensional field of view by utilizing a hologram
and a variable wavelength source of radiation.

      To accomplish deflection, numerous holograms are recorded in
the same volume of a photosensitive medium by holding one beam
direction fixed and simultaneously varying the angle of the other
beam and the recording wavelength.  The angle for each recording may
be a compound angle, with respect to the fixed direction, and
represents the direction into which the diffracted beam will go when
the hologram is illuminated with a beam of that wavelength.  Beam
directions can be in the form of a raster pattern as the wavelength
is scanned monotonically or may be in some arbitrary pattern
depending on the application.  That is, adjacent wavelengths need not
be deflected to adjacent positions in the scan field.

      In the preferred embodiment, for fabrication or use of the
device, a frequency agile laser source is employed, such as a
piezoelectric or current-tuned laser diode, and a photorefractive
recording material such as LiNb0 sub 3.  In addition, the angles are
selected according to the Bragg effect to minimize crosstalk between
adjacent deflection directions.

Disclosed Anonymously.