研究目的
Investigating the performance of a passively Q-switched and mode-locked Tm-Ho co-doped fiber laser using a WS2 saturable absorber fabricated by chemical vapor deposition method.
研究成果
The experimental results show that monolayer WS2 synthesized by chemical vapor deposition is a new type of saturable absorber for achieving a microsecond Q-switched pulse or a nanosecond mode-locked pulse.
研究不足
The commercial autocorrelator cannot measure the pulse width of a nanosecond pulse at 1883.2 nm, so the oscilloscope is used to measure the pulse width in the experiment.
1：Experimental Design and Method Selection:
The experiment involves the use of a WS2 saturable absorber (SA) fabricated by chemical vapor deposition method to achieve passively Q-switched and mode-locked operations in a Tm-Ho co-doped fiber laser.
2：Sample Selection and Data Sources:
The WS2 thin film is prepared by sulfurization of a ～1 nm metal film on a quartz substrate in a tube furnace.
3：List of Experimental Equipment and Materials:
The setup includes a 1570 nm semiconductor laser, a Tm-Ho co-doped fiber, optical isolator, polarization controller, and a 90:10 fiber coupler.
4：Experimental Procedures and Operational Workflow:
The pump power is varied to observe Q-switched and mode-locked operations, with adjustments made to the polarization controller for mode-locking.
5：Data Analysis Methods:
The output pulse train is monitored by an InGaAs photodetector and a 33 GHz oscilloscope, and the spectrum is acquired by a YOKOGAWA AQ6375 spectrum analyzer.
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