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US 5,517,349 AGranted
Process and a device for error correction in acousto-optic deflection of light beams, particularly of laser light
OwnerTorbjorn Sandstrominventor
Life of this patent
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Abstract
A process and a device for compensating wave-front errors occurring in acousto-optical deflectors, with at least one auxiliary deflector which produces a deflected beam whose geometry is independent of the deflection angle and which counteracts the dependence of the deflected beam width on the deflection angle (FIG. 5).
Claims18
A process for correcting errors in light beam deflection by means of acousto-optic diffraction comprising:
- interacting a light beam and a sound-wave field on an interaction plane formed at an oblique angle to wave planes of the sound-wave field within a surrounding medium;
- focusing the deflected beam on a target surface;
- providing at least one beam deflection on a scanning side of the acousto-optic interaction plane, and
- providing a reversed angle-dependence of beam width of the deflected beam to compensate for that caused by acousto-optic deflection in the oblique interaction plane.
1 more element
An acousto-optic scanning device with a high degree of correlation at high scanning speeds, comprising:
- an anisotropic interaction crystal;
- a radio frequency transducer creating a sound field within said crystal;
- an interaction plane forming an oblique angle to wave planes of the sound field;
- and
- an auxiliary deflection element on a scanning side of the interaction plane, said auxiliary deflection element providing an inverse angle-dependence of beam width to that caused by the acousto-optic deflection in the oblique interaction plane, wherein the deflected beam is focused on a target surface.
2 more elements
Dependencies are inferred from the claim text.