研究目的
Investigating the generation of highly stable mode-locked pulses from a side-polished fiber embedded with reduced graphene oxide nanoparticles as a saturable absorber in an erbium-doped fiber laser cavity.
研究成果
The study successfully demonstrates the generation of highly stable mode-locked pulses using an rGO-coated SPF as a saturable absorber in an EDFL cavity. The system performs comparably to other systems utilizing similar materials and has significant potential for telecommunications applications.
研究不足
The optical efficacy of the cavity is relatively low at about 2.6%, attributed to high insertion loss of the SPF and additional losses induced by the rGO-based SA. The quality of the rGO-based SA could potentially be improved to reduce or eliminate minor fluctuations in pulse repetition rate and width.
1：Experimental Design and Method Selection:
The study involves the preparation of reduced graphene oxide (rGO) nanoparticles using Hummer’s technique and hydrothermal reduction, fabrication of a side-polished fiber (SPF) using the wheel polishing technique, and integration of the rGO-coated SPF into an erbium-doped fiber laser (EDFL) cavity to generate mode-locked pulses.
2：Sample Selection and Data Sources:
The samples include rGO nanoparticles and a single-mode fiber (SMF-28) for SPF fabrication. Data sources include UV-Vis spectrometry, Raman analysis, and FESEM for rGO characterization.
3：List of Experimental Equipment and Materials:
Equipment includes a Thermo Scientific Evolution 201 spectrophotometer, Renishaw in Via Raman Microscope System, FEI Quanta FEG 450 Field Emission Scanning Electron Microscope, Newport M-562-D X-Y-Z alignment stages, Yokogawa AQ2201 Tunable Laser Source, Thorlabs optical power meter, and others. Materials include Mesh 7-graphite flakes, sulfuric acid, nitric acid, potassium permanganate, hydrogen peroxide, and deionized water.
4：Experimental Procedures and Operational Workflow:
The process involves the preparation of rGO nanoparticles, fabrication of SPF, deposition of rGO onto SPF, and integration into the EDFL cavity for mode-locked pulse generation.
5：Data Analysis Methods:
Analysis includes optical spectrum analysis, radio frequency characteristics measurement, and autocorrelation measurements to evaluate the mode-locked pulses.
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Yokogawa DLM2054 oscilloscope
DLM2054
Yokogawa
Examining the radio frequency characteristics of the pulse.
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Alnair HAC-200 two-photon absorption autocorrelator
HAC-200
Alnair
Measurements of the mode-locked pulses.
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Thermo Scientific Evolution 201 spectrophotometer
Evolution 201
Thermo Scientific
UV-Vis analysis to determine the absorption characteristics of synthesized rGO nanoparticles.
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FEI Quanta FEG 450 Field Emission Scanning Electron Microscope
Quanta FEG 450
FEI
Examination of the surface morphology of the synthesized rGO.
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Yokogawa AQ2201 Tunable Laser Source
AQ2201
Yokogawa
Injecting a 1550 nm signal into the fiber for monitoring the polishing process.
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Yokogawa AQ6370B optical spectrum analyzer
AQ6370B
Yokogawa
Analysis of the output signal from the mode-locked EDFL.
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Renishaw in Via Raman Microscope System
in Via
Renishaw
Raman analysis to confirm the structure of rGO nanoparticles.
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Newport M-562-D X-Y-Z alignment stages
M-562-D
Newport
Holding a single-mode fiber securely above the polishing wheel during SPF fabrication.
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Thorlabs optical power meter
Thorlabs
Monitoring optical power loss during the polishing process.
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