Source: http://proxy.osapublishing.org/osac/abstract.cfm?uri=osac-2-1-192
Timestamp: 2019-04-22 05:06:44+00:00

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A saturable absorber (SA) based on molybdenum sulfoselenide (MoSSe) was fabricated using a combination of liquid exfoliation and laser deposition methods. A dual-wavelength passively Q-switched Er-doped fiber laser (EDFL) was fabricated by inserting the MoSSe-SA into a ring cavity. The maximum average output power was 23.4 mW. The pulse width decreased from 2.8 to 1.78 μs while the corresponding pulse repetition rate increased from 50 to 90 kHz. To the best of our knowledge, this is the first report on a passively Q-switched EDFL based on a MoSSe-SA operating at 1.5 μm. Our results indicate that MoSSe-like three-element transition-metal dichalcogenides could be a promising alternative optical modulators for pulsed fiber laser generation.
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Fig. 1 (a) Atomic force microscope (AFM) image of MoSSe thin film. (b) The height profile.
Fig. 2 (a) Raman spectrum of MoSSe. (b) X-ray photoelectron spectroscopy (XPS) spectrum of Mo 3d.
Fig. 3 Energy-dispersive X-ray spectroscopy (EDS) image and corresponding S to Se atomic ratio of the MoSSe simple.
Fig. 4 Transmittance versus pump power intensity and its dependence on MoSSe.
Fig. 5 Configuration of pulsed EDFL based on MoSSe SA. WDM: wavelength division multiplexer; EDF: erbium-doped fiber; ISO: insensitive isolator; PC: polarization controller; OC: output coupler; SMF: single-mode fiber.
Fig. 6 (a) Increasing output power with various pump powers, where the red line is without the MoSSe SA and the black line is with the MoSSe SA. (b) Repetition rate and pulse duration versus various pump powers. (c) Calculated single pulse energy and peak power versus various pump powers. (d) Output optical spectrum.
Fig. 7 (a) Pulse train, and (b) temporal pulse profile at highest output power.
Fig. 8 RF spectrum at pump power of 300 mW up to 700 kHz; the inset shows the spectrum up to 200 kHz.

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