| 摘要 |
PURPOSE:To obtain an infrared optical transmission line low in danger of heating by vapor depositing a metal to the inside wall of the coating tube of said line and halogenating said metal. CONSTITUTION:In the method for manufacturing an IR optical transmission line provided with an IR optical transmission body and a coating tube, a metal is vapor deposited to the inside wall of the coating tube and halogenated to obtain an IR optical transmission line provided with a metallic halide film having IR transmittance and lower in refractive index than said body. As said body, metallic halides, such as CsI, CsBr, CsCl, RbI, RbBr, RbCl, KI, KBr, KCl, AgCl, AgBr, TlI, TlBr, TlCl, and a combination of >=2 of them, etc. are exemplified. Since thickness of said metallic halide, if <10mum, is ready to be nonuniform and if <100mum, causes cracks on the film, its preferable thickness is 10- 100mum. |
