研究目的
Investigating the use of ferroferric-oxide nanoparticles (FONPs) as saturable absorbers (SAs) for constructing mode-locked fiber lasers at 1558 nm.
研究成果
The study successfully demonstrated the use of FONPs as SAs for constructing mode-locked fiber lasers at 1558 nm, achieving stable passive mode-locking with a central wavelength of ~1558 nm, a spectral bandwidth of ~0.8 nm, a pulse width of ~4.35 ns, and a repetition rate of ~37.32 MHz. This opens new possibilities for the application of FONPs in nonlinear optical devices.
研究不足
The pulse width of ~4.35 ns is relatively long, which might be related to the slow response time of the FONP SAs. The study suggests that further optimization could improve the performance.
1：Experimental Design and Method Selection:
The study employed FONPs as SAs in an EDFL to achieve mode-locking. The FONPs were prepared by a thermal decomposition method and mixed with sodium carboxymethylcelluose to form a film.
2：Sample Selection and Data Sources:
FONPs with an average diameter of ~20 nm were used. The absorption spectra and nonlinear optical properties of FONPs were measured.
3：List of Experimental Equipment and Materials:
A 980 nm laser diode, erbium doped fiber, polarization insensitive isolator, optical spectrum analyzer, power meter, digital phosphor oscilloscope, and high-speed photodetector were used.
4：Experimental Procedures and Operational Workflow:
The FONP SA was inserted into an EDFL cavity, and the output characteristics were analyzed.
5：Data Analysis Methods:
The dependence of transmission ratio on pump peak density was studied, and the nonlinear optical properties were examined using a Z-scan technique.
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