研究目的
Investigating the use of SnSe2-PVA as a saturable absorber in a dual-wavelength passively mode-locked Yb-doped fiber laser.
研究成果
SnSe2 was successfully prepared and embedded into PVA as a SA in the dual-wavelength passively mode-locked Yb-doped fiber laser. The laser achieved stable mode-locked pulses with a maximum average output power of 2.55 mW and a slope efficiency of about 1.3%. The maximum SNR of 71.04 dB exhibited high stability. The experimental results suggest that SnSe2 is a promising SA candidate for ultrafast fiber lasers.
研究不足
The insert loss of the SnSe2-PVA SA was measured to be about 2.6 dB, indicating that the low output power and optical-to-optical conversion efficiency mainly derived from the large insert loss produced by the SA. The polarization-dependent loss of the SnSe2-PVA SA was negligible.
1：Experimental Design and Method Selection:
The study employed a liquid phase exfoliation method to prepare SnSe2 and embedded it into PVA as a saturable absorber. The nonlinear saturable absorption properties of SnSe2 were investigated using open-aperture Z-scan method.
2：Sample Selection and Data Sources:
SnSe2 solid particles were ground into powder and mixed with alcohol, followed by ultrasonication and centrifugation to prepare the SnSe2 solution. This solution was then blended with PVA solution to form SnSe2-PVA films.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman spectrometer, U-4100 spectrophotometer, and a 1064 nm fiber laser for Z-scan measurements. Materials included SnSe2 powder, PVA, alcohol, and quartz glass substrates.
4：Experimental Procedures and Operational Workflow:
The SnSe2-PVA SA was prepared and characterized. The SA was then integrated into a Yb-doped fiber laser setup to achieve mode-locked pulses. The laser's performance was evaluated by adjusting pump power and polarization states.
5：Data Analysis Methods:
The relationship between pump powers with peak frequencies and SNRs was analyzed. The optical spectra and waveforms of the mode-locked pulses were recorded and analyzed to determine the laser's performance.
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U-4100 spectrophotometer
U-4100
Hitachi
Measuring the linear absorption of SnSe2
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digital phosphor oscilloscope
DPO4104B
Tektronix
Displaying waveforms
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Real-time spectrum analyzer
RSA306
Tektronix
Recording RF spectra
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optical spectrum analyzer
AQ6370C
Yokogawa
Showing optical spectra
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optical power meter
NOVAⅡ
OPHIR
Recording average output power
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probe
PD300R-3W
OPHIR
Measuring optical power
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scanning electron microscope
Recording the microstructures of SnSe2
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transmission electron microscope
Recording the microstructures of SnSe2
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X-ray diffraction
Characterizing the crystal structure of the SnSe2 nanosheets
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Raman spectrometer
Measuring the Raman spectrum of the layered SnSe2
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fiber laser
Light source for Z-scan measurements
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laser diode
Pump source
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wavelength division multiplexer
Delivering the pump light into the ring cavity
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ytterbium-doped fiber
LIEKKI Yb1200-4/125
Laser gain medium
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polarization controllers
Adjusting the polarization states in the ring cavity
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optical coupler
Dividing the output pulses
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photodetector
PD 12D
Converting optical signal into electrical signals
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