研究目的
Investigating the generation of high-energy pulses from a Q-switched Er-doped fiber laser using black phosphorus (BP) with a drop-casting method as saturable absorbers (SAs).
研究成果
The research successfully demonstrates the generation of high-energy pulses from a Q-switched Er-doped fiber laser using BP/PVA film as SAs, achieving the highest pulse energy of 468.03 nJ at 1.5 μm. The drop-casting method proves effective for fabricating BP/PVA films, offering potential applications in remote sensing and other fields requiring high pulse energy.
研究不足
The study focuses on the application of BP/PVA film in Q-switched fiber lasers at 1.5 μm. The limitations include the specific wavelength range and the potential for optimization in the fabrication process of BP/PVA films for higher performance.
1：Experimental Design and Method Selection:
The study employs a drop-casting method to fabricate BP/PVA film as SAs for a Q-switched Er-doped fiber laser. The method is chosen for its simplicity and efficiency in transferring BP and controlling its layer thickness.
2：Sample Selection and Data Sources:
Few-layer BP solution is prepared using liquid-phase exfoliation method with ultra-water as the solvent. PDDA is added to protect BP.
3：List of Experimental Equipment and Materials:
Equipment includes a bath ultrasonicator, centrifuge, Raman spectroscopy with a 633 nm laser, transmission electron microscope (TEM), atomic force microscopy (AFM), and a mode-locked fiber laser for measuring optical properties.
4：Experimental Procedures and Operational Workflow:
BP solution is dropped on PVA film, repeated three times, then covered with another PVA film and sealed. The film is attached to an optical ferrule to act as SAs in the laser cavity.
5：Data Analysis Methods:
The nonlinear saturable absorption of BP-SAs is measured and fitted using a specific formula to determine modulation depth, saturation intensity, and non-saturable absorbance.
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optical analyzer
AQ6375
Yokogawa
Analyzing the performance of pulses with a spectral resolution of 0.2 nm.
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real-time oscilloscope
MSO 4104
Tektronix
Monitoring pulse performance via a fast photodetector.
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erbium-doped fiber
Er30
Used as the gain medium in the laser cavity.
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single mode fiber
SMF-28
Part of the laser cavity.
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wavelength division multiplexer fiber
HI1060
Part of the laser cavity.
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polarization controller
Adjusting the intracavity birefringence.
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optical coupler
Extracting 10% of light from the laser as the output.
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isolator
Ensuring unidirectional operation of the laser.
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980 nm laser diode
Pumping the laser.
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980/1550 nm WDM
Coupling the pump light into the laser cavity.
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