METHOD WHICH DECREASES ANGULAR DIVERGENCE OF LASER BEAM AND DEVICE WHICH IMPLEMENTS SAID METHOD Russian patent published in 1997 - IPC

FIELD: , instruments, in particular, laser communication and control systems, fiber-optical communication systems. SUBSTANCE: method involves anisotropic diffraction of divergent laser beam entering set of acoustic waves which divergence is less than divergence of laser beam. Diffraction type and mean frequency of acoustic waves conform to condition δQ/δf = 0, where Q is dependency of diffraction angle on acoustic beam frequency. EFFECT: increased functional capabilities. 4 cl, 5 dwg