研究目的
Investigating the ultrafast evolution dynamics from bound states (BSs) to single-pulse states (SPSs) in a passively mode-locked fiber laser using the dispersive Fourier-transform (DFT) technique.
研究成果
The study successfully observes the evolution dynamics from BSs to SPSs in a fiber laser, revealing complex soliton-soliton interactions and competition. It highlights the variability in the number of round-trips during transition stages and the diversity of robust soliton pairs. The findings contribute to a deeper understanding of nonlinear dynamics in fiber lasers and suggest areas for future theoretical exploration.
研究不足
The study is limited by the spectral resolution of the DFT configuration (0.34 nm) and the dynamic range resulting from the digitization of the oscilloscope. Additionally, the complex dynamics observed may require further theoretical studies for complete understanding.
1：Experimental Design and Method Selection:
The study employs the dispersive Fourier-transform (DFT) technique for real-time, single-shot measurements of the evolution dynamics from BSs to SPSs in a single-walled carbon nanotube (SWNT)-based ultrafast fiber laser.
2：Sample Selection and Data Sources:
The laser cavity comprises a ～4.2-m long erbium-doped fiber (EDF) as the gain medium and a ～8.6-m long pigtailed single-mode fiber of passive components. The total length of the ring cavity is ～12.8 m.
3：2-m long erbium-doped fiber (EDF) as the gain medium and a ～6-m long pigtailed single-mode fiber of passive components. The total length of the ring cavity is ～8 m.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a 4-GHz, 20-GSa/s real-time oscilloscope (R&S RTO2044), high-speed 6-GHz photodetectors (PDs) (818-BB-51F), an optical spectrum analyzer (OSA) (Yokogawa AQ6370B), and a 5-km long dispersion compensating fiber (DCF).
4：Experimental Procedures and Operational Workflow:
The output light is propagated through the DCF to monitor the shot-to-shot spectral evolution. The temporal profile is detected by the oscilloscope and PDs.
5：Data Analysis Methods:
The spectral information is mapped into the stretched pulses for analysis, with the spectral resolution of the DFT configuration being 0.34 nm.
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