| 摘要 |
PURPOSE:To manufacture an optical fiber made of a silver halide single crystal having high transmission characteristics, by pulling the single crystal from molten silver halide keeping the atmosphere at the pulling zone to a halogen-containing atmosphere and shielding from the radiation of ultraviolet ray and visible light. CONSTITUTION:Silver halide 2 is put into the crucible 1, and molten by the high- frequency heating coil 3. The halogen gas of the same kind as the halogen of the silver halide 2 or a mixture of the gas with an inert gas, is introduced into the shield pipe 4 through the halogen gas introducing pipe 6. The cylindrical seed crystal made of the single crystal of silver halide of the same kind as the silver halide in the crucible 2 is dipped in the molten silver halide 2 from the shaper 8 and pulled up slowly to form a continuous optical fiber 9 made of the single crystal of silver halide through the shaper 8. The formed optical fiber 9 is taken out through the shield pipe 4 and the light-shielding box 7 by the take- off device. |
