GeSe nanosheets
were prepared by ultrasonic-assisted liquidphase
exfoliation (LPE), and the nonlinear saturated absorption performance was
experimentally studied. The modulation depth and saturation intensity of the
prepared GeSe saturable absorber (SA) were 15% and 1.44 MW/cm2,
respectively. Using the saturated absorption
characteristics of GeSe SA, a passively Q-switched erbium-doped fiber laser was systematically
demonstrated. As the pump power increases, the pulse repetition
frequency increases from 22.8 kHz to 77.59 kHz.
The shortest pulse duration is 1.51 μs, and the corresponding pulse energy is 46.14 nJ. Experimental results show that GeSe nanosheets can be used
as high-efficiency SA in fiber lasers. Our results will provide a useful
reference for demonstrating pulsed fiber lasers based on GeSe equipment.
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