Patent ID: 6088150
Filing Date: 2000-07-11
Classification: G02F,H04N

Abstract:
A 3-channel modulation system for a high power laser comprising:a laser light source;a light modulator comprising an acousto-optic device for modulating the light generated from said laser light source and including a pair of electrodes having a predetermined area disposed on one side of said light modulator;an image signal generating sub-system for generating an image signal;a drive circuit sub-system for operating said electrodes so that the image signal being generated from said image signal generating sub-system is provided through said electrodes to said light modulator;a first cylindrical lens positioned at an input side of the light modulator between said laser light source and said light modulator so that area and form of the light generated from said laser light source are modified and the modified light enters said light modulator; anda second cylindrical lens positioned on an output side of said light modulator to modify the area and form of the light modulated by said light modulator,wherein the magnitude of said electrodes is adjusted by the following expression so as to maximize the diffraction efficiency of said light modulation means, where .eta. is light modulator efficiency, P.sub.a is acoustic power, H is electrode width, L is electrode length, .lambda..sub.0 is laser wavelength, M.sub.2 is acousto-optic figure of merit, and cos .theta. is (cos .theta..sub.i cos .theta..sub.d).sup.1/2 in case of birefringent diffraction: ##EQU5##