Abstract:
A method and an apparatus for manufacturing a fluoride glass fiber preform are disclosed which preclude the step of pouring a glass melt into a mold from a crucible, and hence permit the fabrication of a long, homogeneous fluoride glass fiber preform free from foreign substances and air bubbles leading to scattering and which also allow ease in the fabrication of a preform having an elliptic core portion for drawing a polarized wave retaining fiber.
Abstract:
An improved method of rapidly forming halide glass wherein the heating and cooling schedule has two phases of heating and cooling. This improved method substantially limits the loss of volatile components because of the significantly shortened interval of time at the elevated melting temperatures. The average time under heating is about 80 minutes. Cooling is as rapid as possible. The homogenization occurs above 800.degree. C. for about 20 minutes.
Abstract:
An improved method of making carbon dioxide and chlorine free fluoride-based glass wherein the atmosphere in the furnace enclosure is sulphur hexafluoride gas at a positive over pressure.
Abstract:
A method for the manufacture of a preform of barium containing heavy metal fluoride glass comprising a core and a jacket for drawing infrared light waveguides for optical communications technology by casting molten glass onto a predetermined body of solid glass. Hitherto, such a method was executed such that molten core glass was cast into a tube of jacket glass. In order to achieve thicker preforms, one proceeds such here that a solid row of the core glass is surrounded with molten jacket glass. The boundary surface between core and jacket of the generated preform can be improved in the method disclosed herein that the surface of the solid rod is etched before being surrounded with the jacket glass. A nearly perfect boundary surface is obtained by etching with a ZrOCl.sub.2 solution.
Abstract:
PURPOSE:To produce a thin membrane of the fluorinated amorphous material capable of utilization as the infrared optical material by mixing the respective fluorides of Ba, Sr, Ca, Li and Al in the specified proportion, making the melt thin membrane-like and ultraquenching it. CONSTITUTION:In a formula xMF2.yLiF.zAlF3 (x+y+z=1), the mixture is melted wherein the component M is at least one kind of metallic fluoride selected among Ba, Sr and Ca and it consists of the composition of the compo nent range of x=0.2-0.6 y=0.2-0.6 z=0.1-0.4. Then this melt is sent between the metallic rollers to ultraquench it and made to a thin membrane body (about 60mu thickness) having the uniform membrane thickness. Thereby the amorphous material excellent in the infrared rays permeability is obtained.
Abstract translation:目的:通过以规定的比例混合Ba,Sr,Ca,Li,Al的各自的氟化物,制造能够作为红外线光学材料利用的氟化非晶质的薄膜,使其熔融薄膜化并超薄化 。 构成:在配方xMF2.yLiF.zAlF3(x + y + z = 1)中,混合物熔化,其中组分M是选自Ba,Sr和Ca中的至少一种金属氟化物,它由 x = 0.2-0.6 y = 0.2-0.6 z = 0.1-0.4的组成范围。 然后将这种熔体送到金属辊之间进行超强化,并制成具有均匀膜厚度的薄膜体(约60μm厚)。 由此,得到红外线透过性优异的非晶质材料。
Abstract:
PURPOSE:To obtain easily the titled preform by charging molten fluoride glass for a clad into a casting mold having a round rod uprighted at the central part, pulling out the rod, and introducing molten fluoride glass for a core into the resulting hollow. CONSTITUTION:A round metallic or glass rod 9 is uprighted and fixed at the central part of the bottom 8 of a casting mold 1 made of metal or glass. Molten fluoride glass 2 for a clad is charged into the mold 1 and solidified by cooling. Molten fluoride glass 4 for a core is then charged into the mold 1. At the same time, the bottom 8 having the uprighted rod 9 is pulled out, and the glass 4 is introduced into the resulting hollow and solidified. A preform 10 for a single-mode optical fluoride fiber having a core of a small diameter and high roundness is obtd., and said fiber is manufactured by drawing the preform 10.