研究目的
Investigating noise-like pulse (NLP) generation in a mode-locked thulium-doped fiber laser with nonlinear amplifying loop mirror (NALM) and different net anomalous dispersions.
研究成果
The all-PM-fiber mode-locked Tm-doped laser based on NALM successfully generated NLPs with adjustable repetition frequencies and different net anomalous dispersions. The shortest NLP spike generated was 232 fs, which is the shortest reported for fiber lasers operating in the 2-μm spectral region. The laser's performance suggests its suitability for applications like supercontinuum generation.
研究不足
The study was limited by the experimental conditions, such as the inability to perform long-range autocorrelation scans for some measurements. Additionally, the output FC/APC connector was damaged several times during the study, requiring replacements that could have affected the results.
1：Experimental Design and Method Selection:
The study utilized an all-polarization maintaining (PM) fiber oscillator with a nonlinear amplifying loop mirror (NALM) to generate noise-like pulses (NLPs). Different lengths of PM passive fiber were used in the NALM loop to adjust the net anomalous dispersion and investigate its effect on NLP generation.
2：Sample Selection and Data Sources:
The experiment used heavily doped, single-mode PM thulium-doped fiber (Nufern, PM-TSF-5/125) as the active medium. Different lengths of PM1950 fiber were spliced into the NALM loop to vary the net dispersion.
3：List of Experimental Equipment and Materials:
The setup included a mode-locked thulium-doped fiber laser (TDFL) with NALM, PM thulium-doped fiber, PM1950 fiber, pump lasers (EYDFLs), wavelength division multiplexers (WDMs), a polarization-sensitive fiber optic isolator, and an output coupler (OC).
4：Experimental Procedures and Operational Workflow:
The laser was pumped at different power levels to achieve mode-locking and NLP generation. The properties of the generated NLPs were analyzed using optical spectrum analyzers, digital oscilloscopes, RF spectrum analyzers, and autocorrelators.
5：Data Analysis Methods:
The data were analyzed to determine the spectral width, central wavelength, pulse duration, and energy of the NLPs. The effect of net anomalous dispersion on these properties was investigated.
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