研究目的
Investigating the generation of high-energy dissipative soliton resonance (DSR) and rectangular noise-like pulse (NLP) in a figure-9 thulium-holmium-doped mode-locked fiber laser.
研究成果
The study successfully demonstrates the generation of high-energy DSR pulses and rectangular NLPs in a F9 thulium-holmium-doped fiber laser, achieving record pulse energies in the 2 μm region. The findings provide insights into nonlinear dynamics of square-wave pulses in dissipative systems and offer a versatile optical source for potential applications.
研究不足
The study is limited by the output power of the EDFAs and the selection of fiber length and type, which may affect the maximum achievable pulse energy. The investigation is also constrained to the 2 μm wavelength region.
1：Experimental Design and Method Selection
The study utilizes a figure-9 (F9) mode-locked thulium-holmium-doped fiber laser configuration with a nonlinear amplifying loop mirror (NALM) and a 50/50 optical coupler (OC) for mode-locking and reflection, respectively. The design aims to achieve high-energy DSR and NLP pulses by optimizing pump power and polarization controllers (PCs).
2：Sample Selection and Data Sources
The gain medium is a 4.7 m long thulium-holmium co-doped fiber (THDF, TH512 from Coractive), with a group velocity dispersion parameter of ?0.073 ps2 m?1 at 1900 nm. The fiber is bi-directionally pumped by two erbium-doped fiber amplifiers (EDFAs).
3：List of Experimental Equipment and Materials
Optical spectrum analyzer (Yokogawa AQ6375), second-harmonic autocorrelator (FR-103XL), 8 GHz oscilloscope (Keysight Infiniium DSOS804A), 1 GHz photodetector, and radio frequency (RF) signal analyzer (Agilent N9020 A).
4：Experimental Procedures and Operational Workflow
The experiment involves adjusting pump power and PCs to achieve DSR and NLP regimes. Pulse characteristics are monitored using the listed equipment to analyze temporal profiles, spectra, and RF spectra.
5：Data Analysis Methods
Data analysis includes measuring pulse duration, average output power, pulse energy, and peak power under varying pump conditions. Autocorrelation traces and RF spectra are used to distinguish between DSR and NLP states.
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optical spectrum analyzer
AQ6375
Yokogawa
Monitoring the output spectrum of the mode-locked pulse trains
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oscilloscope
Infiniium DSOS804A
Keysight
Monitoring the temporal profile of the pulse trains
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RF signal analyzer
N9020 A
Agilent
Analyzing the RF spectrum of the pulse trains
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thulium-holmium co-doped fiber
TH512
Coractive
Gain medium in the fiber laser
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second-harmonic autocorrelator
FR-103XL
Not provided
Measuring autocorrelation traces of the pulses
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photodetector
Not provided
Not provided
Detecting optical signals for analysis
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