研究目的
To investigate the soliton collisions between soliton molecules and deuterogenic solitons in an ultrafast erbium-doped fiber laser mode locked with MoS2 saturable absorber, and to observe the dynamics of these collisions using the time-stretch dispersion Fourier transform technique.
研究成果
The study successfully investigated the entire process of soliton collision dynamics in a MoS2-based bound-state soliton fiber laser using the TS-DFT technique. The findings show the self-stabilization of soliton molecules and provide insights into the intricate dynamic evolution of conventional soliton rain.
研究不足
The study focuses on a simplified soliton rain dynamics where a soliton molecule replaces the condensed phase, which may not fully capture the complexity of conventional soliton rain dynamics. The structural component of the soliton molecule is simpler than in the condensed soliton phase, which might limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The study employed an anomalous dispersion passively mode-locked erbium-doped fiber laser (EDFL) composed by a 2-m erbium-doped fiber (EDF) and a 13-m-long single-mode fiber (SMF). Mode locking was passively achieved by a MoS2-deposited microfiber. The TS-DFT technique was used for real-time measurement on a shot-to-shot level.
2：Sample Selection and Data Sources:
The laser output was temporally stretched by a 1-km-long dispersion compensation fiber (DCF). The temporal optical intensity was detected by a 50-GHz photodiode and evaluated by a 36-GHz oscilloscope.
3：List of Experimental Equipment and Materials:
The setup included a 980-nm laser diode (LD), a 980/1550-nm wavelength-division multiplexer (WDM), a polarization-independent optical isolator (PI-ISO), a polarization controller (PC), and optical couplers (OCs).
4：Experimental Procedures and Operational Workflow:
The laser polarization state was adjusted by a PC to trigger the appearance of a cw component. The pump power was fixed at 105 mW and later boosted to 200 mW to capture the spatio-temporal evolution of the collision dynamics.
5：Data Analysis Methods:
The single-shot spectrum was Fourier transformed to acquire the field autocorrelation, which exhibited the pulse separation between successive solitons.
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