Abstract
We have demonstrated femtosecond laser microhole drilling inside a fused silica optical fiber with optical inner surface quality. An optical quality microhole with a diameter of \(3\, \upmu \hbox {m}\) and a length of approximately \(35\, \upmu \hbox {m}\) was produced inside an optical fiber of a cladding diameter of \(125\, \upmu \hbox {m}\). The microhole drilling inside an optical fiber was caused as a result of plasma filamentation of focused femtosecond laser irradiation at a wavelength of 400 nm. The size of the microhole was reproduced with a ray trace of the focused laser beam with consideration of self-focusing. The optical quality of the microhole was verified by measuring the transmittance of 94 % of infrared diode emission.
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Acknowledgments
This work has been supported by Grants-in-Aid for Scientific Research (KAKENHI) from Japan Society for the Promotion of Science (JSPS), Grant Number JP15K04735.
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Shiraishi, M., Goya, K., Nishiyama, M. et al. Femtosecond laser microhole drilling inside a fused silica optical fiber with optical inner surface quality. Appl. Phys. A 122, 825 (2016). https://doi.org/10.1007/s00339-016-0352-9
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DOI: https://doi.org/10.1007/s00339-016-0352-9