Abstract:
There is disclosed a fiber optic waveguide which is particularly suited for infrared radiation transmission at extended wavelengths. The core of the waveguide is fabricated from heavy ionic compounds selected from metal halides in order to achieve such extended infrared transparency. While it is impossible to prepare these materials into optical fibers using conventional fiber drawing techniques, the present invention teaches how such materials may be prepared into optical fibers using an extrusion process at elevated temperatures and high pressures.
Abstract:
Hot pressing of fluoride glasses is provided. These glasses are synthesized from ZrF.sub.4 -BaF.sub.2 and HfF.sub.4 -BaF.sub.2 systems. Hot pressing rough blanks in a closed die made of hard, polished, optically-figured material, such as cobalt-bonded tungsten carbide, is done by pressing the glasses at a temperature between that of the softening point of the glass and its crystallization temperature and at a pressure sufficient to cause flow of the glass at the pressing temperature. As a consequence, mechanical polishing steps on all glass surfaces is eliminated, thereby minimizing surface contamination.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for molding glass complex optical components such as lenses, microlens, arrays of microlenses, and gratings or surface-relief diffusers having fine or hyperfine microstructures. SOLUTION: Mold masters or patterns, which define the profile of the optical components, made on a metal array, particularly titanium or nickel alloys, or refractory compositions, with or without a non-reactive coating are provided. The non-oxide glasses, such as chalcogenide glasses, chalcohalide glasses, and halide glasses, are used in the mold either in bulk, planar, or powder forms. In the mold, the glass is heated to about 10-110°C, preferably about 50°C, above its transition temperature (Tg), at which temperature the glass has a viscosity that permits it to flow and conform exactly to the pattern of the mold. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PURPOSE:To obtain a clad glass pipe for an optical fiber transmitting infrared rays by fixing a quartz glass pipe to the outer frame of a metallic mold splittable into a plurality of segments and having a cylindrical hollow part, pouring molten fluoride glass in the gap between the frame and the pipe, and slowly cooling the glass after annealing. CONSTITUTION:A thin-walled glass pipe 7 with a high m.p. is fixed at the central axial part of a mold having outer frames 1, 1' splittable into a plurality of segments and forming a cylindrical hollow part 4, and after preheating the mold to a temp. close to the transition temp. of fluoride glass, molten fluoride glass is poured in the gap between the pipe 7 and the frames 1, 1'. The mold is then kept at a temp. several-several 10 deg.C below the transition temp. of the fluoride glass to anneal the glass, and it is slowly cooled. After the cooling the frames 1, 1' are detached to take out the fluoride glass formed in the interior. The internal thin-walled glass pipe 7 is scraped away.