Abstract
The output power in ultrafast fiber lasers is usually limited due to the lack of a versatile saturable absorber with high damage threshold and large modulation depth. Here we proposed a more efficient strategy to improve the output energy of erbium-doped fiber laser based on indium selenide (In2Se3) prepared by using the physical vapor deposition (PVD) method. Finally, stable mode-locked bright pulses and triple-wavelength dark–bright pulse pair generation were obtained successfully by adjusting the polarization state. The average output power and pulse energy were 172.4 mW/101 nJ and 171.3 mW/100 nJ, which are significantly improved compared with the previous work. These data demonstrate that the PVD-In2Se3 can be a feasible nonlinear photonic material for high-power fiber lasers, which will pave a fresh avenue for the high-power fiber laser.
Highlights
Ultra-fast mode-locked fiber lasers with the virtues of miniaturization, good stability, and beam quality have attracted great attention due to promising applications in industrial manufacturing, biomedicine, defense, optical imaging, and nonlinear optical conversion [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
When studying various nonlinear phenomena, high-power mode-locked fiber lasers often serve as ideal platforms and powerful experimental tools
As is known to all, owing to the Kerr effect, self-mode-locked or Q-switching often occurs in the ring fiber laser cavity
Summary
Ultra-fast mode-locked fiber lasers with the virtues of miniaturization, good stability, and beam quality have attracted great attention due to promising applications in industrial manufacturing, biomedicine, defense, optical imaging, and nonlinear optical conversion [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. As the key nonlinear optical element in the passively mode-locked laser, excellent saturable absorbers (SAs) have always been the goal of scientific researchers [15]. Various types of two-dimensional (2D) materials were widely employed as passive SAs in mode-locked fiber lasers [16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35].
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