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Extended resolution light deflector using surface acoustic waves

  • US 4,370,030 A
  • Filed: 05/27/1980
  • Issued: 01/25/1983
  • Est. Priority Date: 05/27/1980
  • Status: Expired due to Term
First Claim
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1. In an acousto-optic device comprising a piezo-electric substrate (12) having relatively flat sides, a first set of interdigital electrodes (60) on one side of the substrate (12), said electrodes introducing on the surface of said substrate acoustic waves (62) in response to a predetermined electrical deflector signal (80, 82) applied to said interdigital electrodes, an illuminating light beam (10) introduced into said substrate (12) through a side adjacent to the side with said interdigital electrodes (60), said beam directed at said side at an angle such that the light beam suffers total internal reflection near grazing incidence off the active surface where the acoustic waves (62) are generated, in a plane perpendicular to the direction of travel of the acoustic waves, the output beam being reflected from the active surface containing the acoustic waves and leaving said substrate through the remaining portion of said substrate in a zero order undiffracted direction (92) and a first order diffracted direction (90), wherein the improvement is characterized by:

  • a second set of interdigital electrodes (72) on the same side of said substrate as said first set of interdigital electrodes (60) and in the path of said acoustic waves introduced on the surface of said substrate by said first set (60) of interdigital electrodes, said second set of interdigital electrodes being positioned in said path of said acoustic waves so as to introduce new acoustic waves of the same frequency and in phase with and thereby amplifying the acoustic waves (62) introduced by said first set of interdigital electrodes.

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