| 摘要 |
A laser-active optical fiber for a fiber laser or an optical fiber amplifier contains a laser-active fiber core ( 2 ) comprising an undoped inner region ( 22 ) which is surrounded by an outer region ( 24 ) that is doped with a laser-active material. In this manner a high-power laser beam may be generated which has a mode structure, present in the form of a ring mode, which in particular is suitable for laser machining.
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