Journal
OPTIK
Volume 243, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2021.167279
Keywords
Bubble poking method; Fe3O4 nanoparticles; Fiber lasers; Q-switched
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Funding
- China National Key RD Program [2020YFB2205802]
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A novel erbium-doped Q-switched fiber laser at 1.5 mu m with Fe3O4 nanoparticles as a saturable absorber is experimentally demonstrated, showing stable laser output, high saturable intensity and maximum single pulse energy. The laser operates with a maximum repetition rate of 57.5 kHz, a minimum pulse width of 5.7 mu s and a pump threshold of 50 mW.
We experimentally demonstrate an erbium-doped Q-switched fiber laser at 1.5 mu m by incorporating Fe3O4 nanoparticles as a saturable absorber. A novel approach for SA formation is demonstrated by using the bubble poking method, through which we can fabricate SA films with different thicknesses with ease by changing the number of times of poking the bubbles. The fabricated SA possesses a modulation depth of similar to 3.9% and saturable intensity of similar to 0.57 MW/cm(2). By inserting the SA into the laser cavity, Q-switched laser output is achieved at a pump threshold of 50 mW and the central wavelength can be switched when the pump power is above 70 mW. This Q-switched all-fiber laser operates stably with a maximum single pulse energy of 126 nJ, a maximum repetition rate of 57.5 kHz and a minimum pulse width of 5.7 mu s.
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