Review of femtosecond laser direct writing fiber-optic structures based on refractive index modification and their applications

作者：Jian Zhao, Yong Zhao, Yun Peng, Ri-qing Lv, Qiang Zhao · 发表于：Optics and Laser Technology · 年份：2022 · DOI：10.1016/j.optlastec.2021.107473 · 被引用次数：54 · 研究领域：Materials Science

Abstract Femtosecond (fs) laser pulses direct writing technology has been extensively employed to achieve microfabrication in various optical fibers for a broad range of applications. In this paper, the latest development of fiber-optic structures based on refractive index (RI) modification under fs-laser irradiation and their applications are reviewed. Firstly, the processing mechanism of fs-laser direct writing for optical fiber RI modification is described. And then, the fiber-optic structures including various fiber gratings and interferometers based on RI modification are summarized. It shows that the fs-laser direct writing technology has great advantages in the fabrication of various fiber structures with excellent properties. Furthermore, the applications of these RI-modified fiber-optic structures in sensors, lasers, birefringence adjustable elements, and couplers are also discussed. To conclude, the performances of RI-modified structures and their applications are presented and compared.