| 摘要 |
PURPOSE:To obtain an optical fiber for IR which is protected against the moisture of the external air and has high structural stability by forming an amorphous carbon film on the outer side face of an optical fiber material for IR. CONSTITUTION:The optical fiber 1 for IR is constituted by forming the amorphous carbon film 3 by sputtering on a fiber base body 2 consisting of polycrystalline or single crystalline NaCl having a prescribed shape. Since the amorphous carbon film 3 has the characteristic to allow the transmission of 0.2-25mum wavelength light, the film permits the conduction of intermediate IR light (several mum - several tens Xm). The amorphous carbon film 3 prohibits the intrusion of water to the fiber base body 2 side and prevents the elution of the NaCl. The amorphous carbon film 3 is highly resistant to heat (up to about 300 deg.C), acids and alkalis and therefore, the film has the function as the effective and stable protective film even if the installation conditions and environmental conditions for the optical fiber 1 are taken into consideration. |
