摘要
We report the fabrication of long-period gratings （LPGs） in elliptical microfibers with femtosecond laser. Based on the numerical analysis of the modes and the mode coupling condition of elliptical microfibers, an LPG is fabricated with a very short pitch of 10 μm by periodically modifying the fiber surface, which demonstrates very strong polarization-dependent resonances, a very low temperature sensitivity of a few picometers in air, and high temperature sensitivity of -1.62 nm/℃ in refractive index oil.
We report the fabrication of long-period gratings （LPGs） in elliptical microfibers with femtosecond laser. Based on the numerical analysis of the modes and the mode coupling condition of elliptical microfibers, an LPG is fabricated with a very short pitch of 10 μm by periodically modifying the fiber surface, which demonstrates very strong polarization-dependent resonances, a very low temperature sensitivity of a few picometers in air, and high temperature sensitivity of -1.62 nm/℃ in refractive index oil.
基金
supported by the National Natural Science Foundation of China(Grant No.61605168)
the Natural Science Foundation of Hebei Province,China(Grant No.F2016203392)
the College and University Science and Technology Research Project of Hebei Province,China(Grant No.QN2016078)
the Science and Technology Project of Qinhuangdao City(Grant No.201601B050)
the Intramural Doctoral Foundation of Yanshan Universtiy(Grant No.B1011)
