研究目的
Investigating the use of a hybrid NCF-GIMF structure as both a saturable absorber and a wavelength selector in an L-band wavelength tunable and dual-wavelength mode-locked fiber laser.
研究成果
The NCF-GIMF device effectively serves as both a SA and a wavelength selector, enabling tunable and dual-wavelength mode-locked fiber laser operations. The device's advantages include low saturation intensity, simple structure, and good robustness, offering a new perspective for compact and cost-effective laser sources.
研究不足
The large insertion loss when increasing the length of NCF suppresses the oscillation at other wavelengths, limiting the wavelength tuning operation. The device's polarization degree of ~3 dB indicates mode locking is not due to the NPR effect.
1：Experimental Design and Method Selection:
The study employs a hybrid NCF-GIMF structure as both the SA and the wavelength selector in an Er-doped mode-locked fiber laser. The methodology includes the construction of the NCF-GIMF device and its integration into the laser cavity.
2：Sample Selection and Data Sources:
The samples include a section of 180.5 μm NCF spliced to a GIMF with the length of ~13 cm. Data sources include optical spectrum analyzer, autocorrelator, oscilloscope, and RF analyzer outputs.
3：5 μm NCF spliced to a GIMF with the length of ~13 cm. Data sources include optical spectrum analyzer, autocorrelator, oscilloscope, and RF analyzer outputs. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a 600mW laser diode, WDM, EDF, PC, ISO, and a 90:10 fused coupler. Materials include NCF and GIMF fibers.
4：Experimental Procedures and Operational Workflow:
The procedure involves adjusting the PC to achieve tunable and dual-wavelength mode-locking operations, monitoring the laser output with various analyzers.
5：Data Analysis Methods:
Data analysis includes measuring the spectral evolution, pulse duration, and RF spectrum to evaluate the laser's performance.
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optical spectrum analyzer
AQ6370D
YOKOGAWA
Monitors the laser output spectrum.
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autocorrelator
pulseCheck 150
APE
Measures the pulse duration.
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oscilloscope
TDS5104B
Tektronix
Records the pulse train.
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photon detector
DET08CFC
Thorlabs
Detects the laser pulses.
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RF analyzer
E4407B
Agilent
Analyzes the RF spectrum of the laser output.
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laser diode
600mW
Provides the pumping light for the laser cavity.
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WDM
980 nm/1550 nm
Couples the pumping light into the laser cavity.
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EDF
SM-ESF-7/125
Nufern
Acts as the gain medium in the laser cavity.
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PC
Adjusts the intra-cavity polarization state.
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ISO
Ensures unidirectional propagation of the laser in the cavity.
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fused coupler
90:10
Provides the laser output and feedback into the cavity.
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