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
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.