Optical scanner

Abstract

Abstract PURPOSE:To prevent an optical waveguide from the generation of optical damage by constituting the titled device of transparent electrodes and counter electrodes and forming diffraction gratings on the surface of the transparent electrodes. CONSTITUTION:The diffraction gratings G1-Dn formed on the surface of individual electrodes D1-Dn are formed as converging diffraction gratings and beams 14 radiated from the diffraction gratings G1-Gn are converged upon one point on a body 25 to be scanned. The converging diffraction gratings G1-Gn are juxtaposed by arranging two-dimensional curve-like grating patterns in parallel in the beam 14 advancing direction in the optical waveguide layer 11 and changing the curvature of respective patterns and pitches between adjacent patterns and provided with a converting function. If only the converging diffraction gratings are used, a lens array 30 or a lens array layer 31 can be omitted and the structure of the optical scanner can be simplified. Consequently, a gap part between electrodes can be expanded, the width of the waveguide can be expanded and the energy density of wave-guided light can be set up to a smaller value, so that the optical waveguide can be prevented from the generation of optical damage.

Inventors

• 👤 Hiroshi Sunakawa
• 👤 寛 砂川
• 👤 Chiaki Goto
• 👤 後藤　千秋

Bibliographic Details