| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a quartz tube inner surface treatment method capable of performing a surface treatment of the inside of the quartz tube, while suppressing a discharge amount of a global warming gas, a manufacturing method of an optical fiber preform and a manufacturing method of an optical fiber. <P>SOLUTION: The quartz tube 10 inner surface treatment method comprises an inner surface treatment process S10 of treating the inner surface 10a of the quartz tube 10 with chlorine, specifically, of heating the quartz tube 10 to≥1,800°C while supplying a chlorine-containing gas into the quartz tube 10. In this case, the discharge of a global warming gas in the inner surface treatment process S10 for the quartz tube 10 is suppressed since the inner surface 10a of the quartz tube 10 is treated with the chlorine while heating the quartz tube 10 to≥1,800°C without using a global warming gas. As a result, a treating method suitable for the prevention of global warming has been provided. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
