Apparatus and method providing improved control of a laser beam

Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal

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350358, 350355, 346108, 358347, G02F 132, H04B 900, H01S 310

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active

044994370

ABSTRACT:
The present invention provides method and apparatus for angularly deflecting and intensity modulating a laser beam. Specifically, an acousto-optic cell is driven by a signal that causes a laser beam incident thereon to be deflected through an angular range .DELTA..theta. and intensity modulated in accordance with a number of pixels N.sub.pix of information per angular deflection range .DELTA..theta.. The number of pixels N.sub.pix per angular range .DELTA..theta. is, in accordance with the invention, substantially larger than a resolution parameter N.sub.res defined by ##EQU1## where .DELTA.f is the frequency range in the drive signal which produces the angular deflection .DELTA..theta., D is the effective diameter of the incident laser beam, V.sub.s is the acoustic velocity of the acousto-optic cell, and .epsilon. is a constant referred to as the "beam separation constant" and is defined below.

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