研究目的
To develop a compact all-fiber system for generating stable and tunable mid-infrared Raman solitons using a heavily germanium doped fiber pumped in the anomalous dispersion regime.
研究成果
The system successfully generates stable, tunable mid-infrared Raman solitons with high efficiency and excellent stability, providing a compact and high-performance source for various applications. Future work could extend the wavelength range and improve output characteristics.
研究不足
The wavelength tunability is limited to 2.01-2.42 μm due to fiber loss beyond 2.4 μm and saturation effects at higher pump powers. Efficiency and output power could be improved by optimizing fiber length, pump pulse parameters, and GeO2 concentration.
1：Experimental Design and Method Selection:
The system uses a home-made
2：96 μm femtosecond fiber laser to pump a 10 m-long heavily germanium doped fiber (HGDF) with 12 μm core diameter and 64 mol.% GeO2 dopant in the strong anomalous dispersion region to excite soliton self-frequency shift (SSFS) for generating Raman solitons. Sample Selection and Data Sources:
The HGDF is designed to have a zero-dispersion wavelength shifted to ~
3：48 μm for anomalous dispersion at 1965 nm. Optical spectra, pulse characteristics, and RF spectra are measured. List of Experimental Equipment and Materials:
Includes a home-made 1965 nm ultrafast seed oscillator, two thulium-doped fiber amplifiers (TDFAs), the HGDF, optical spectrum analyzer (Bristol 721B), photodetector (Electro-Optics Technology ET-5000F), oscilloscope (Agilent DSO9404A), RF spectrum analyzer, autocorrelation system, and power meter (Coherent Field MaxII-TO).
4：Experimental Procedures and Operational Workflow:
The seed laser is amplified by TDFAs, and pulses are launched into the HGDF. Output is characterized using OSA, oscilloscope, RF analyzer, and autocorrelator. Pump power is varied to observe SSFS evolution.
5：Data Analysis Methods:
Spectral analysis, pulse duration measurement via autocorrelation, RF spectrum analysis for stability, and power measurements.
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