| 摘要 |
PURPOSE:To obtain easily a single-mode optical fluoride fiber having a core of a small diameter by putting a fluoride glass preform having a core-clad structure in a fluoride glass pipe and by heating and drawing them. CONSTITUTION:A fluoride glass preform 8 having a core-clad structure is prepd., and it is heated, drawn, and put in a jacket pipe 9 covered with a fluororesin tube 10. While evacuating the pipe 9 with a rotary pump, the preform 8 and the pipe 9 are heated with a small-sized electric furnace 11 and drawn into a fiber, which is wound around a bobbin. Thus, a single-mode optical fluoride fiber having a core of a small diameter is easily obtd. The fiber can be used as a single- mode waveguide in the wavelength range of 2-4mum, the ratio in diameter between the core and clad of the fiber is 1:>=5, and the fiber has such strength as to fit for handling. |
