研究目的
Investigating the performance of tungsten disulfide saturable absorber (WS2-SA) in a passively Q-switched YVO4/Nd:YVO4/YVO4 laser at 1342.2 nm.
研究成果
The study successfully demonstrated a passively Q-switched YVO4/Nd:YVO4/YVO4 laser using a WS2-SA at 1342.2 nm for the first time. The results show that WS2 is a suitable saturable absorber for all-solid-state lasers at 1.3 μm, with potential for further optimization and application in the near-infrared region.
研究不足
The layer number of WS2 wafer is estimated to be 1–2, indicating the band-gap of WS2 shifts from indirect to direct. Direct-gap monolayer WS2 is not conducive to generation of stable Q-switched pulses. The preparation process of WS2-SA needs optimization to improve pulse stability.
1：Experimental Design and Method Selection:
The study employed a passively Q-switched laser setup using a WS2-SA and YVO4/Nd:YVO4/YVO4 crystal. The WS2-SA was prepared by liquid phase exfoliation method.
2：Sample Selection and Data Sources:
The WS2 solution was prepared with a concentration of 1 mg/ml and dripped onto a glass substrate to form the saturable absorber.
3：List of Experimental Equipment and Materials:
A fiber-coupled laser-diode emitting at 808 nm was used as the pump source. The laser crystal was YVO4/Nd:YVO4(0.3 at.%)/YVO4. An oscilloscope (RTO1014, Rohde & Schwarz, GER) and a power meter (LaserPoint, ITA) were used to record the output characteristics.
4：3 at.%)/YVOAn oscilloscope (RTO1014, Rohde & Schwarz, GER) and a power meter (LaserPoint, ITA) were used to record the output characteristics.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser setup included flat mirror M1 as input mirror and a flat-concave mirror M2 as output coupler. The WS2-SA was inserted into the cavity to observe Q-switched pulses.
5：Data Analysis Methods:
The output power, pulse width, and repetition rate were measured and analyzed to evaluate the performance of the WS2-SA in the laser system.
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