| 摘要 |
PURPOSE:To precisely, simply and optionally form a damage part by irradiating a laser beam to an optical fiber or the side part of an optical fiber product to form the damage part. CONSTITUTION:An optical fiber 5 is set up on a turn table 6 or the like to be turned in the X and Y directions and a laser beam 2 is irradiated to a prescribed side part of the fiber 5. The condensed laser beam 2 has high power density and melts a fine portion instantaneously to form a damage part 5A immediately. The damage part 5A extended along the fiber axis of the optical fiber 5 can be also easily formed. The damage part 5A can be also formed on a tape-like or fabric-like fiber product 5' or a continuous damage part 5' like a curve can be also formed on the fiber product 5'. Thus, a required damage part can be highly precisely formed within a short period.
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