High-quality fiber Bragg grating inscribed in ZBLAN fiber using femtosecond laser point-by-point technology
Lin Chen, Cailing Fu, Zhihao Cai, Pengsheng Shen, Yu Fan, Huajian Zhong, Chao Du, Yanjie Meng, Yiping Wang, Changrui Liao, Jun He, Weijia Bao
Abstract
We demonstrate for the first time, to the best of our knowledge, the fabrication of a high-quality fiber Bragg grating (FBG) in ZBLAN fiber by using an efficient femtosecond laser point-by-point technology. Two types of FBG, e.g., high coupling coefficient and narrow bandwidth grating, are successfully obtained. The coupling coefficient is strongly dependent on the grating order and pulse energy. A second-order FBG with an ultrahigh coupling coefficient of 325 m −1 and reflectivity of 97.8% is inscribed in the ZBLAN fiber. A pair of FBGs with a narrow FWHM of 0.30 and 0.09 nm are also demonstrated.
Topics & Concepts
ZBLANFiber Bragg gratingOpticsMaterials scienceGratingFiber laserPHOSFOSFemtosecondOptical fiberOptoelectronicsLaserGraded-index fiberFiber optic sensorPhysicsAdvanced Fiber Optic SensorsPhotonic Crystal and Fiber OpticsAdvanced Fiber Laser Technologies