研究目的
Investigating the generation of scalar and vector noise-like pulses in a bidirectional nonlinear polarization rotation based mode-locked fiber laser.
研究成果
The study successfully demonstrates the first observation of scalar and vector noise-like pulses emitted from a bidirectional NPR based mode-locked fiber laser. The polarization resolved measurement validates the scalar and vector features of NLPs, unveiling the polarization dynamics of internal pulses inside the NLPs.
研究不足
The study is limited by the specific design of the fiber laser and the conditions under which scalar and vector noise-like pulses are generated. Further optimization of the laser cavity design and pump power may enhance the performance.
1：Experimental Design and Method Selection:
The study employs a bidirectional nonlinear polarization rotation based mode-locked fiber laser design to emit scalar and vector noise-like pulses in opposite directions. Polarization resolved measurement is used to validate the vector noise-like pulses.
2：Sample Selection and Data Sources:
The experiment utilizes a 2m Er-doped fiber as the gain medium, pumped by two 980-nm laser diodes through a wavelength division multiplexer.
3：List of Experimental Equipment and Materials:
Equipment includes a polarizer sandwiched by two polarization controllers, a 2×2 50:50 output coupler, two three-port circulators, a 0.5 m PMF, and a PBS together with PC3 for analyzing output pulses.
4：5 m PMF, and a PBS together with PC3 for analyzing output pulses. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The setup involves adjusting in-line PCs to achieve self-started mode-locking operation above the threshold pump power. Polarization resolved measurement is conducted to analyze the output solitons and NLPs.
5：Data Analysis Methods:
The analysis includes examining spectra and autocorrelation traces to identify scalar and vector characteristics of the pulses.
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Er-doped fiber
Gain medium of the fiber laser
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laser diodes
980-nm
Pump source for the Er-doped fiber
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wavelength division multiplexer
980/1550 nm
Combines pump and signal wavelengths
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polarizer
Initializes the mode-locking
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polarization controllers
Adjusts the polarization state of the light
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output coupler
2×2 50:50
Emits the counter-propagation pulses
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three-port circulators
Bridges the two counter-propagation branches into the main cavity
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PMF
0.5 m
Enhances the local birefringence in the CW branch
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PBS
Analyzes the output pulses
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