Importance

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Abstract

Unwanted interference effects arising in those high speed laser scanning systems, particularly those used in printing, employing an acousto-optical modulator for scanning with a plurality of focussed beams simultaneously in order to reduce the required deflection scan rate, and to better the rise and fall times of the waveforms, are largely eliminated by arranging a pair of Bragg deflection cells one behind the other with the directions of propagation of the acoustic waves in the cells substantially 90 degrees apart with respect to each other. The undeflected beam of light is projected onto the cells at the Bragg angles for both cells. Substantially, the same results obtain as though a single Bragg cell were used but devoid of acoustical interference effects.

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First Claim