研究目的
To demonstrate a stable Q-switched erbium-doped fiber laser (EDFL) using silver nanoparticles (AgNPs) as a passive saturable absorber.
研究成果
The study successfully demonstrated a stable Q-switched EDFL using AgNPs as a passive saturable absorber. The D-shaped fiber with AgNPs coating showed efficient Q-switching performance, with the ability to lase at a threshold of 35.2 mW and produce pulses at the maximum applicable pump power of 65.7 mW. The highest repetition rate and narrowest pulse width were recorded for specific samples, indicating the potential for optimization in future studies.
研究不足
The study is limited to the use of AgNPs as a saturable absorber and the specific fabrication method of D-shaped fibers. The performance of the Q-switched laser is dependent on the polishing depth and the coating of AgNPs.
1：Experimental Design and Method Selection:
The study involves the fabrication of a D-shaped silica fiber coated with AgNPs using electron beam deposition method. Four different sizes of D-shaped fiber were used, controlled by observing the loss during the polishing process.
2：Sample Selection and Data Sources:
Four samples with losses of 1.2 dB, 2 dB, 3 dB, and 3.5 dB were prepared.
3：2 dB, 2 dB, 3 dB, and 5 dB were prepared. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Standard single mode optical fiber (Corning SMF-28), electron beam machine (Model EB43-T), 980 nm laser source, wavelength division multiplexer (WDM), optical isolator, polarization controller (PC), optical coupler, optical spectrum analyzer (OSA), digital oscilloscope (OSC), radio frequency spectrum analyzer (RFSA), photodetector, broadband optical power meter.
4：Experimental Procedures and Operational Workflow:
The D-shaped fiber was fabricated using wheel polishing technique, coated with AgNPs, and integrated into an EDFL cavity. The laser performance was analyzed using various optical instruments.
5：Data Analysis Methods:
The output was observed using OSA for spectral analysis, OSC and RFSA for temporal analysis, and optical power meter for average output power measurement.
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Corning SMF-28
SMF-28
Corning
Standard single mode optical fiber used in the fabrication of D-shaped fiber.
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Electron Beam Machine
EB43-T
Used for depositing silver nanoparticles onto the D-shaped fiber.
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980 nm Laser Source
Used as a pump source for the erbium-doped fiber laser.
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Wavelength Division Multiplexer
WDM
Used to combine the pump light with the signal light in the fiber laser cavity.
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Optical Isolator
Prevents bidirectional light propagation inside the cavity.
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Polarization Controller
PC
Used to finely tune the birefringence property inside the cavity.
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Optical Coupler
Used to extract the laser for measurement.
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Optical Spectrum Analyzer
OSA
Used for spectral analysis of the laser output.
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Digital Oscilloscope
OSC
Used for temporal analysis of the laser output.
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Radio Frequency Spectrum Analyzer
RFSA
Used for temporal analysis on frequency domain.
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Photodetector
Used to interpret the pulsed laser output.
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Broadband Optical Power Meter
Used to measure the average output power of the lasers.
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