研究目的
To demonstrate the use of Tungsten trioxide (WO3) film as a passive saturable absorber (SA) for generating Q-switched pulses in an erbium-doped fibre laser.
研究成果
The WO3-PVA film SA successfully generated stable Q-switched pulses in an erbium-doped fibre laser with a maximum pulse energy of 142.85 nJ and a signal to noise ratio of 70 dB, indicating its potential for photonics applications.
研究不足
The study is limited to the use of WO3-PVA film as an SA in an erbium-doped fibre laser, and the performance is evaluated within a specific pump power range.
1：Experimental Design and Method Selection:
The study involves the fabrication of a WO3-PVA film SA and its integration into an erbium-doped fibre laser cavity to generate Q-switched pulses.
2：Sample Selection and Data Sources:
The WO3 nanoparticles used were about 40 nm with 99% purity. The PVA solution was prepared by blending PVA powder in deionized water.
3：List of Experimental Equipment and Materials:
The setup includes a 980 nm laser diode, WDM fibre, EDF, optical isolator, 3 dB output coupler, and the WO3 SA device.
4：Experimental Procedures and Operational Workflow:
The WO3-PVA film was prepared by drop and casting method, and the Q-switched laser performance was evaluated by varying the pump power from 40 to 195 mW.
5：Data Analysis Methods:
The output pulse train was analyzed using a digital oscilloscope, and the optical spectrum was measured using an OSA.
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WO3 nanoparticles
40 nm
Used as a saturable absorber in the laser cavity
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PVA powder
Used to prepare the PVA solution for embedding WO3 nanoparticles
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980 nm laser diode
Used as the pump source for the erbium-doped fibre laser
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WDM fibre
Used in the laser cavity for wavelength division multiplexing
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EDF
2 m long
Used as the gain medium in the laser cavity
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Optical isolator
Used to prevent reflection in the ring cavity and ensure unidirectional operation
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3 dB output coupler
Allows half of the laser output to be taken out for observation and the other half to remain in the ring cavity
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Optical spectrum analyser
Used to measure the optical spectrum of the laser
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Digital oscilloscope
500-MHz
Used to analyze the output pulse train
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RF spectrum analyser
7.8 GHz
Used to evaluate the stability of the laser and the Q-switching repetition rate
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