ACOUSTOOPTICAL FREQUENCY FILTER Russian patent published in 2001 - IPC

FIELD: fiber optics. SUBSTANCE: invention can be employed for design of resonator of semiconductor laser. Filter has section of optical fiber and radiator and absorber of elastic waves made fast to it, thin-walled cylindrical jacket for winding of optical fiber on it, completely or partially. Jacket has at least one through slit on which opposite sides radiator and absorber are positioned over entire length of sides of slit for coverage of optical fiber. Reflection factor of the order of 0.3 in 1.0-10.0 kHz filtration band is achievable. EFFECT: widened functional capabilities of filter thanks to increase of length of acoustooptical interaction on isotropic periodic structure and region of homogeneity of elastic vibrations. 7 cl, 2 dwg