研究目的
To demonstrate passive mode-locked erbium-doped fiber lasers (EDFLs) based on tungsten disulfide (WS2) and molybdenum disulfide (MoS2) saturable absorbers (SAs) for ultrafast photonic applications.
研究成果
The study successfully demonstrates the use of WS2 and MoS2 SAs in generating stable mode-locked pulses in EDFLs. These materials offer a simple, low-cost, and efficient solution for ultrafast photonic applications, with potential benefits across various fields.
研究不足
The study is limited by the high insertion loss of the SAs, which affects the slope efficiency of the laser. The mode-locking operation range is also constrained by the pump power, with instability observed at higher power levels.
1：Experimental Design and Method Selection:
The study employs a ring laser cavity configuration with a total length of 204 m, including a 2.4-m-long erbium-doped fiber (EDF) as the gain medium. The cavity operates in anomalous fiber dispersion to facilitate soliton pulse generation. WS2 and MoS2 SAs are fabricated using a drop and casting method and integrated into the laser cavity for mode-locking.
2：4-m-long erbium-doped fiber (EDF) as the gain medium. The cavity operates in anomalous fiber dispersion to facilitate soliton pulse generation. WS2 and MoS2 SAs are fabricated using a drop and casting method and integrated into the laser cavity for mode-locking.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: WS2 and MoS2 solutions are prepared using liquid exfoliation method, and their saturable absorption properties are characterized.
3：List of Experimental Equipment and Materials:
The setup includes a 980-nm laser diode pump, wavelength division multiplexer (WDM), polarization-independent isolator, 90:10 coupler, and optical spectrum analyzer (Yokogawa, AQ6370B).
4：Experimental Procedures and Operational Workflow:
The SA is placed in the laser cavity, and mode-locking is achieved by adjusting the pump power. Output characteristics are measured using an oscilloscope, photodetector, and RF spectrum analyzer.
5：Data Analysis Methods:
The nonlinear saturable absorption of the SAs is measured using a power-dependent transmission technique. Pulse characteristics are analyzed using autocorrelation and spectral analysis.
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