研究目的
Investigating the generation of high-power, large-energy, intra-cavity Raman solitons within a passively mode-locked Yb-doped fiber laser using a high-damage-threshold MoS2 saturable absorber.
研究成果
The experiment successfully demonstrated high-power, large-energy, mode-locked intra-cavity Raman solitons using a high-damage-threshold MoS2 SA. The results provide a foundation for future designs of Raman soliton fiber lasers based on two-dimensional materials as SAs.
研究不足
The study is limited by the available maximum pump power and the resolution of the atomic force microscope (AFM) used for characterizing the MoS2 film. Future work could explore the non-continuous characteristics of the MoS2 and its influence on the properties of the SA.
1：Experimental Design and Method Selection
A double-end-pumped ring laser cavity was designed to generate Raman solitons. The experiment utilized a high-damage-threshold MoS2 saturable absorber (SA) prepared by the chemical vapor deposition (CVD) technique. The methodology included adjusting polarization states to achieve stable single- or dual-pulse Raman soliton operations.
2：Sample Selection and Data Sources
The samples included MoS2 materials prepared on fluorophlogopite mica (FM) and sapphire substrate using the CVD method. Data sources were derived from the characterization of MoS2 SA and the output performance of the fiber laser.
3：List of Experimental Equipment and Materials
Equipment included two 976 nm laser diodes (LDs), a piece of ~0.9 m long Yb-doped fiber (Nufern, LMA-YSF-10/125), a polarization independent isolator (PI-ISO), two polarization controllers (PC1 and PC2), a 30:70 output coupler (OC), and a ~290 m single mode fiber (SMF). Materials included MoS2 SA and the substrates for its preparation.
4：Experimental Procedures and Operational Workflow
The experimental setup involved pumping the laser cavity with two 976 nm LDs, using the Yb-doped fiber as the gain medium, and incorporating the MoS2 SA for mode-locking. The operational workflow included adjusting the pump power and polarization states to achieve Raman soliton operations.
5：Data Analysis Methods
Data analysis involved measuring the output characteristics of the laser, including emission spectra, average output power, pulse train, and pulse shape. Nonlinear optical properties of the MoS2 SA were analyzed using a two-arm detection method.
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