Abstract:
L' invention concerne la réalisation d'un matériau, de forme parallélépipédique ou cylindrique, formé d'au moins deux constituants, qui peuvent être des métaux ou des composés chimiques solides, le matériau obtenu étant stratifié, fritté ,découpé et traité thermiquement.
Abstract:
An optical fiber which is able to transmit high power infrared energy, and is flexible and long in life is described. The fiber consists essentially of a mixed crystal of 40 to 45 wt % of thallium bromide and the balance of thallium iodide, each having a purity not less than 99.9%. The fiber is free of any particles having a size not smaller than 1 mu m.
Abstract:
A crystalline metal halide optical fiber having a two or a three layer structure. The core consists of relatively small crystals. An inner crust surrounds the core and has the same composition but consists of relatively large crystals. An optical outer crust surrounds the inner crust and has a different composition from the inner crust but has generally the same sized crystals. The differing crystal sizes can be produced from a preform by extruding a crystal at a low uniform temperature at a relatively high speed.
Abstract:
A glass optical waveguide preform is formed by chemical reaction of gaseous and/or vapourised ingredients (A and B) within a glass substrate tube (52). A reactant feed tube (50) extends Into a first end of the substrate tube (52). One of the reactants (A) flows through the feed tube (50), and another (B) flows through the annular channel between the feed (50) and substrate (52) tubes. The reactants (A and B) combine just downstream of the end of the feed tube (54) and react to form particulate material, of which at least a portion is deposited on the substrate tube (52). The output end of the feed tube (50) traverses (58, 60) the substrate tube (52) so that the region of maximum soot deposition moves along the length of the substrate tube. A hot zone (54, 56) traverses (18a', 18b') the substrate tube (52) in synchrony (58) with the feed tube (50) to sinter the deposited soot.
Abstract:
An infrared light transmitting optical fiber and a process for producing the same are disclosed. The infrared light transmitting optical fiber is produced by a process comprising preparing a core crystalline fiber having a high melting point and a high refractive index, forming around the core fiber a continuous layer of cladding crystal having a low melting point and a low refractive index, and subsequently forming a protective layer on the resulting step-index fiber.
Abstract:
PURPOSE:To obtain a polycrystalline optical fiber for IR light which is straight and is free from defects such as bending and waving by extruding the optical fiber for IR light perpendicularly downward while exerting tension thereto in the same direction. CONSTITUTION:A weight 7 is mounted to the end of the optical fiber 6 for IR light right after the fiber is extruded and exposed from a die 1. Then the tension equivalent to the weight 7 is perpendicularly downward exerted to the extruded fiber 6. The extruded fiber 6 is made entirely free from bending by making preliminarily the extruding hole direction of the die 1 to coincide with the perpendicular direction. The weight 7 is particularly effective for correcting the bend when the plasticity of the fiber 6 right after the extrusion is large. The trouble in the case of protecting the polycrystalline optical fiber with a pipe, etc. is thus eliminated if such fiber is used as an optical waveguide to be used for a laser surgical knife, laser beam processing machine, etc. using laser light of high-density energy.
Abstract:
PURPOSE:To obtain an optical fiber which is particularly suitable for IR rays and of which the refractive index changes gradually from the core to the clad by depositing and diffusing the mixed crystal material of a metallic halide compd. or the metallic halide mixed crystal material of the compsn. different from the above-mentioned mixed crystal by evaporation on the surface of the mixed crystal material of the fiber- shaped metallic halide. CONSTITUTION:A branch pipe 14 for contg. the metallic halide 16 is provided in the central part of a straight pipe part 12 made of a thick-walled transparent quartz tube and the part 12 and 14 are arranged to be heated respectively by heaters 18, 19, by which the straight pipe part of the device is constituted. The fiber 24 made of the mixed crystal material of the metallic halide such as TlBr-TlI or AgCl-AgBr is supported between a pair of supports 20 and 22 and is supported into such straight pipe part. The inside of the pipes 12, 14 is evacuated to a vacuum and is then heated and TlBr different from the mixed crystal material 24 or AgCl-AgBr different from the mixed crystal 24 in the compsn. ratio is deposited by evaporation as the metallic halide 16, by which the optical fiber having the refractive index changing continuously from the core to the clad part is obtd. The loss in the fiber side face is thus decreased, the divergence of the light at the end face is decreased and the condensability is improved.