Abstract
This study proposes a facile method for fabricating long-period fiber gratings. Optical designs were created so that laser light could be written into the grating structure on the fiber cladding without the need to remove the protective polyimide (PI) buffer layer. A laser-assisted wet chemical etching process was used to fabricate a long-period fiber grating and to identify the etching rate and depth of the grating. Refraction occurred when the laser light first passed through the PI layer, and the refracted beam ablated the grating structure between the fiber cladding and the PI layer. The PI coating facilitated ablation by the refracted laser beam of regions in the fiber without the need to remove the buffer layer. Wet etching resulted in the formation of periodic crown structures on the fiber grating due to different etching speeds of the laser-ablated regions on the grating. The fiber sensor had a diameter of 55 μm and a period of 660 μm.
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Acknowledgements
This study was financially supported by a grant from the Ministry of Science and Technology of Taiwan and by grant MOST 110-2221-E-992-054-MY3 and MOST 110-2222-E-309-001-.
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Wen, HY., Hsu, HC., Weng, JJ. et al. A facile process for fabricating long-period fiber grating sensors using a refracted laser beam and laser-assisted wet etching. Appl Nanosci 12, 2265–2276 (2022). https://doi.org/10.1007/s13204-022-02476-9
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DOI: https://doi.org/10.1007/s13204-022-02476-9