研究目的
Investigating the tunability of a passively Q-switched Erbium-doped fiber laser (EDFL) using a graphene oxide saturable absorber (SA) and Sagnac interferometer operation.
研究成果
The study successfully demonstrated a wavelength tunable Q-switched EDFL based on Sagnac interferometer operation with a graphene oxide SA. The laser's performance was examined at different operating wavelengths, showing potential for simple and cost-effective pulsed laser sources in various applications.
研究不足
The tuning range of the laser could be improved by reducing the PMF length or shortening the total loop diameter of the SLM. The Q-switching performance could also be enhanced by optimizing the SA parameters and the laser cavity design.
1：Experimental Design and Method Selection
The study employs a figure-of-eight laser configuration incorporating a graphene oxide saturable absorber (SA) and a Sagnac loop mirror (SLM) for wavelength tuning via temperature adjustment.
2：Sample Selection and Data Sources
The SA polymer film was constructed from graphene oxide material produced from commercial graphene flakes via an electrochemical exfoliation process. The EDF gain medium has a core diameter of 4 μm, a numerical aperture of 0.16, and an erbium ion absorption of 23 dB/m at 980 nm.
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
The setup involved a ring cavity with a pump laser diode, WDM coupler, EDF, optical isolator, graphene-oxide based SA, and an output coupler. The SLM was adjusted via temperature to tune the laser wavelength.
5：Data Analysis Methods
The performance of the laser was analyzed based on output spectra, temporal characteristics, RF spectrum, and output power measurements.
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Optical spectrum analyser
AQ6370B
Yokogawa
Observing the wavelength distribution of the laser output light.
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RF Spectrum Analyzer
MS2683 A
Anritsu
Examining the radio frequency (RF) power spectrum.
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Digital oscilloscope
GDS-3352
GWINSTEK
Temporal analysis of the laser output.
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Photodetector
InGaAs
Not specified
Detecting the laser output for temporal analysis.
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Power meter
OMM-6810B
ILX Lightwave
Measuring the output power.
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Power-head
OMH-6727B InGaAs
ILX Lightwave
Measuring the output power in conjunction with the power meter.
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