研究目的
To demonstrate a stable bright/dark switchable mode-locked nanosecond pulse fiber laser incorporating black phosphorus (BP) in the Yb-doped fiber ring cavity for the first time.
研究成果
The research successfully demonstrated a bright/dark switchable mode-locked Yb-doped fiber laser based on BP, with the ability to switch states by adjusting the intra-cavity polarization. The findings expand the application of BP in nonlinear and ultrafast photonics, suggesting potential for future optoelectronic and digital applications.
研究不足
The study was limited to the Yb-doped fiber laser configuration and the specific fabrication method of the BP-SA. The long cavity length may affect the laser performance, indicating a need for optimization in future work.
1：Experimental Design and Method Selection:
The experiment involved constructing a ring cavity with a Yb-doped fiber, incorporating a BP saturable absorber (SA) fabricated by a modified electrochemical delamination exfoliation process. The states between bright and dark pulses were switched by adjusting the intra-cavity polarization states.
2：Sample Selection and Data Sources:
High-quality BP bulk crystals were fabricated and exfoliated into flakes, which were then made into a thin film for the SA device.
3：List of Experimental Equipment and Materials:
The setup included a semiconductor laser diode, Yb-doped fiber, wavelength division multiplexing (WDM), polarization-independent isolator (PI-ISO), coupler, polarization controllers (PCs), and the BP-SA device.
4：Experimental Procedures and Operational Workflow:
The laser was pumped by a 976 nm diode, and the output was monitored using an optical spectrum analyzer, oscilloscope, and optical power meter.
5：Data Analysis Methods:
The output characteristics were analyzed for pulse duration, spectrum, and stability, with theoretical modeling using the cubic Ginzburg-Landau equation (CGLE).
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semiconductor laser diode
Pumping the fiber ring cavity
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Yb-doped fiber
6/125
Gain medium in the fiber ring cavity
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wavelength division multiplexing
976/1064 nm
Combining pump and signal wavelengths
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polarization-independent isolator
Ensuring unidirectional propagation in the cavity
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coupler
20/80
Splitting the laser output
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polarization controllers
Adjusting the intra-cavity polarization states
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black phosphorus saturable absorber
Mode-locking the fiber laser
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optical spectrum analyzer
Monitoring the output spectrum
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oscilloscope
1 GHz
Monitoring the pulse characteristics
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optical power meter
Monitoring the output power
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