Distortion-free femtosecond laser inscription in free-standing optical fiber
In this paper, we report the first experimental demonstration, to the best of our knowledge, of low-energy distortion-free femtosecond laser inscription in a free-standing fiber without the need for oil immersion. The methodology proposed features radial-plane beam shaping to eliminate the focal-poi...
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| Published in | Applied optics. Optical technology and biomedical optics Vol. 55; no. 21; p. 5575 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
20.07.2016
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| Online Access | Get more information |
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| Summary: | In this paper, we report the first experimental demonstration, to the best of our knowledge, of low-energy distortion-free femtosecond laser inscription in a free-standing fiber without the need for oil immersion. The methodology proposed features radial-plane beam shaping to eliminate the focal-point distortion induced by the cylindrical geometry of the fiber, thus achieving optimal focusing and spot-like inscription within the fiber. Based on the proposed methodology, a strong, first-order fiber Bragg grating is achieved for the first time, to the best of our knowledge, in a coated free-standing single-mode fiber by using the point-by-point inscription technique with only 50 nJ laser pulse energy. |
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| ISSN: | 2155-3165 |
| DOI: | 10.1364/AO.55.005575 |