ESSE 2017 (Proceedings of the International Conference on Environmental Science and Sustainable EnergyEd.by ZhaoYang Dong) || Transverse-Load Characteristics of Long Period Fiber Gratings Fabricated By Femtosecond Laser Pulses

摘要： The transverse-load characteristics of long period fiber gratings (LPFGs) fabricated by 800 nm femtosecond laser are demonstrated and investigated. It is observed that the resonant wavelength of LPFG is dependent on the direction of applied force. When a transverse load is applied along different orientations of the LPFG, the resonant wavelength will experience red shift or blue shift. However, the transmission attenuation is gradually decreases as the applied transverse-load increases, which is independent of the direction of applied force. This is mainly due to the asymmetrical distribution of the refractive index on the cross-section of LPFG induced by femtosecond laser pulses, the load-induced birefringence lead to the rotation of optical principal axes in the LPFG.