| 摘要 |
PURPOSE:To obtain an optical fiber having high circularly polarized light retentivity by drawing molten glass from an elliptical hole while twisting the glass and by coating the resulting core glass with clad glass. CONSTITUTION:The 1st crucible 1 for molten core glass 4 is put in the 2nd crucible 2 for molten clad glass 5 so that the central axis of the elliptical hole of the crucible 1 is allowed to coincide with that of the circular hole of the crucible 2 and that the crucible 1 is rotated around the central axis of the crucible 2. Heaters 3 are placed at the outside of the crucibles 1, 2, and core glass 4 in the crucible 1 and clad glass 5 in the crucible 2 are melted with the heaters 3. The molten core glass 4 in the crucible 1 flows out of the bottom elliptical hole while being twisted around the axial line of the crucible 1 by the rotation of the crucible 1, and it is coated with the molten clad glass 5 in the crucible 2 and drawn from the bottom circular hole of the crucible 2 to form an optical fiber 6 retaining circularly polarized light. |
