Photonics Research, 2017, 5 (1): 01000052, Published Online: Feb. 8, 2017  

Q-switched fiber laser based on saturable absorption of ferroferric-oxide nanoparticles Download: 973次

Author Affiliations
MOE Key Laboratory of Space Applied Physics and Chemistry, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
Abstract
We demonstrate that ferroferric-oxide (Fe3O4) nanoparticles exhibit nonlinear saturable absorption property at 1.55 μm, and fabricate two filmy saturable absorbers by embedding the nanoparticles into a polyvinyl alcohol (PVA) film or polyimide (PI) film separately. In the Fe3O4-PVA (Fe3O4-PI) Q-switched fiber laser, the pulse repetition rate increases from 8.5 kHz (5.5 kHz) to 28 kHz (49 kHz) and the pulse duration decreases from 23.5 μs (47 μs) to 6 μs (3.5 μs) by varying the pump power from 25 mW (23 mW) to 150 mW (650 mW). Experiment results indicate that PI-based saturable absorbers can afford larger powers than PVA-based saturable absorbers, which can be attributed to the higher fusion point of the PI film. The Fe3O4-PI saturable absorber exhibits features of high damage threshold, low cost, and good flexibility, which could be applied in fields of near-infrared pulse generation and frequency conversions.

Dong Mao, Xiaoqi Cui, Wending Zhang, Mingkun Li, Tianxian Feng, Bobo Du, Hua Lu, Jianlin Zhao. Q-switched fiber laser based on saturable absorption of ferroferric-oxide nanoparticles[J]. Photonics Research, 2017, 5(1): 01000052.

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