A Femtosecond-Laser-Induced Fiber Bragg Grating with Supermode Resonances for Sensing Applications
A Bragg grating is inscribed into the cladding of an all-solid photonic bandgap fiber by use of side femtosecond illumination. Multimode resonances are observed, with calculations resulting from guided supermodes in the cladding by the phase matching condition. All supermode resonances show nearly t...
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| Published in | Chinese physics letters Vol. 31; no. 9; pp. 69 - 72 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.09.2014
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0256-307X 1741-3540 |
| DOI | 10.1088/0256-307X/31/9/094204 |
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| Summary: | A Bragg grating is inscribed into the cladding of an all-solid photonic bandgap fiber by use of side femtosecond illumination. Multimode resonances are observed, with calculations resulting from guided supermodes in the cladding by the phase matching condition. All supermode resonances show nearly the same sensitivity to strain and temperature, about 0.98 pm/℃ and 12. 78 pm/℃, respectively, while their resonant wavelengths are insensi- tive to bend. An annealing test shows that this grating can endure temperatures higher than 1100℃ where it can still keep high reflectivity and good repeatability. Such a Bragg grating could have potential applications in fiber sensors for strain and temperature measurements, with low cross-sensitivity to bend or an external refractive index, especially in harsh environments. |
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| Bibliography: | A Bragg grating is inscribed into the cladding of an all-solid photonic bandgap fiber by use of side femtosecond illumination. Multimode resonances are observed, with calculations resulting from guided supermodes in the cladding by the phase matching condition. All supermode resonances show nearly the same sensitivity to strain and temperature, about 0.98 pm/℃ and 12. 78 pm/℃, respectively, while their resonant wavelengths are insensi- tive to bend. An annealing test shows that this grating can endure temperatures higher than 1100℃ where it can still keep high reflectivity and good repeatability. Such a Bragg grating could have potential applications in fiber sensors for strain and temperature measurements, with low cross-sensitivity to bend or an external refractive index, especially in harsh environments. 11-1959/O4 LIU Ning-Liang, LIU Shu-Hui, LU Pei-Xiang（ 1. College of Science, Huazhong Agricultural University, Wuhan 430070 2.School of Physics, Huazhong University of Science and Technology, Wuhan 430074） |
| ISSN: | 0256-307X 1741-3540 |
| DOI: | 10.1088/0256-307X/31/9/094204 |