Quartz-based optical fiber with a lens and its manufacturing method
First Claim
1. A quartz-based optical fiber with a lens comprising:
- a core which is comprised of a first quartz-based glass,a clad which surrounds the core, the clad being comprised of a second quartz-based glass,the first quartz-based glass of the core having a lower etching speed with respect to a hydrofluoric acid etching solution than that of the second quartz-base glass of the clad,the core forming a lens section with a curved surface projecting from an end surface of the clad, andsaid clad being free of any tapered portion, at least one portion of the end surface of the clad being a flat surface and which is perpendicular to an axial length direction of the optical fiber.
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Accused Products
Abstract
A quartz-based optical fiber with a lens, wherein a lens shaped in a curved surface is directly formed on an end surface, and its manufacturing method are provided, the quartz-based optical fiber with a lens having a lens section formed by a projecting core shaped in a curved surface on the end surface, the lens section being produced by immersing the end surface section of the quartz-based optical fiber, which consists of a core and a clad having a composition in which the etching speed is higher than that of the core when a hydrofluoric acid solution is applied, in the hydrofluoric acid solution to cause a core shaped in a truncated cone to project from the end surface of said quartz-based optical fiber, then heating and melting the core shaped in the truncated cone and the vicinity thereof, thus changing the truncated cone shape into a curved surface shape.
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Citations
15 Claims
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1. A quartz-based optical fiber with a lens comprising:
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a core which is comprised of a first quartz-based glass, a clad which surrounds the core, the clad being comprised of a second quartz-based glass, the first quartz-based glass of the core having a lower etching speed with respect to a hydrofluoric acid etching solution than that of the second quartz-base glass of the clad, the core forming a lens section with a curved surface projecting from an end surface of the clad, and said clad being free of any tapered portion, at least one portion of the end surface of the clad being a flat surface and which is perpendicular to an axial length direction of the optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification