METHOD OF MANUFACTURING A SILICA GLASS PREFORM

摘要

The method of manufacturing a silica glass base preform comprises the steps of inserting a rod-like member (31, 61) mainly containing a ductile material, into a forming space (20, 50) of a mold (11, 12, 12, 41, 42, 43), charging the remaining space of the forming space (20, 50) with a forming material (32, 62) containing silica glass powder or doped silica glass powder, compressing the mold (11, 12, 13, 41, 42, 43) charged with the forming material (32, 62) from outside such as to form a porous glass body (33) of the forming material (32, 62) around the rod-like member, removing the rod-like member (31, 62) from the porous glass body (33), inserting a glass rod (34) into the hole (33a) formed after removal of the rod-like member (31, 61), purifying said porous glass body (33) in which the glass rod (34) is inserted, and consolidating said porous glass body (33) purified in the above purifying step.