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Published on: July 25, 2022
Broadband polarization-insensitive saturable absorption of Fe2O3 nanoparticles
Dong Mao1, Xiaoqi Cui, Zhiwen He
1MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China. maodong@nwpu.edu.cn jlzhao@nwpu.edu.cn.
Abstract:
The synthesis and functionalization of transition-metal oxides are one of the most active research areas in advanced materials. As a typical transition-metal oxide, iron oxide has been widely used in lithium-ion batteries, gas sensors, and for water treatment. Herein, we synthesized Fe2O3 nanoparticles by a co-precipitation method that is inexpensive and non-toxic. The Fe2O3 nanoparticles exhibited broadband saturable absorption. Furthermore, thin Fe2O3 polyvinyl alcohol films were prepared to realize Q-switched operations in a ytterbium-doped fibre laser, an erbium-doped fibre laser, and a thulium-doped fibre laser. Attributed to the polarization-insensitive feature of the saturable absorber, Q-switched cylindrical vector beams were also generated based on mode coupling and selection in two-mode fibre lasers. Such Fe2O3 nanoparticles show great promise for use in Q-switching applications of infrared fibre lasers and cylindrical vector lasers.
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