研究目的
Investigating the generation of highly stable passive mode locking laser pulses in a thulium doped fibre laser using a WS2-ZnO composite as a saturable absorber.
研究成果
The study successfully demonstrates a highly stable mode locking laser with a pulse width of 1.27 ps and repetition rate of 9.98 MHz using a WS2-ZnO composite as a saturable absorber. The laser's large SNR value and central wavelength make it highly stable and applicable for ultrafast pulses in the eye-safe region.
研究不足
The study does not explore the optimization of the laser cavity’s length for shorter pulse widths and higher repetition rates, which could potentially improve the laser's performance.
1：Experimental Design and Method Selection:
The study employs a WS2-ZnO composite as a saturable absorber in a thulium doped fibre laser to generate mode-locked pulses. The nonlinear optical performance of the SA is investigated using a balanced twin-detector measurement system.
2：Sample Selection and Data Sources:
WS2 powder is exfoliated into few-layer WS2 sheets using the liquid phase exfoliation technique. The WS2-ZnO composite is prepared by mixing exfoliated WS2 sheets with Zn(OH)2 solution.
3：List of Experimental Equipment and Materials:
Equipment includes a Renishaw inVia Raman microscope, FEI Nova NanoSEM 400 field emission scanning electron microscope, Varian Cary 50 UV–vis Spectrophotometer, and an autocorrelator for pulse width measurement.
4：Experimental Procedures and Operational Workflow:
The WS2-ZnO composite is characterized using Raman measurement, absorption spectrum, and modulation depth analysis. The composite is then used in a TDFL cavity with dual pumping scheme to generate mode-locked pulses.
5：Data Analysis Methods:
The optical spectrum, pulse width, and repetition rate of the generated pulses are analyzed. The stability of the laser is tested over time.
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