研究目的
To demonstrate spectrally flat supercontinuum generation in a ZBLAN fiber pumped by an erbium-doped mode-locked fiber laser for potential applications in optical sensing.
研究成果
The study successfully demonstrates a flat supercontinuum generation in a ZBLAN fiber with spectral fluctuation less than 1.29 dB over 1571.8 nm to 1803.1 nm. Optimizing the pulse width and peak power of the seed source improves the spectral flatness, indicating potential applications in long-distance optical sensing.
研究不足
The spectral broadening is limited by the intrinsic material losses in the long wavelength for silica fibers. The study is also limited by the equipment's power capacity, with the average output power of SC limited to 52.5 mW.
1：Experimental Design and Method Selection:
The experiment involves generating a flat supercontinuum (SC) using a ZBLAN fiber pumped by a mode-locked fiber laser. The spectral flatness is improved by connecting standardized single-mode fibers of different lengths to the laser output before amplification.
2：Sample Selection and Data Sources:
A 10-m-long ZBLAN fluoride fiber is used as the nonlinear medium. The seed source is an erbium-doped mode-locked fiber laser incorporating carbon-nanotube-based saturable absorbers.
3：List of Experimental Equipment and Materials:
Equipment includes an erbium-doped fiber laser, carbon-nanotube-based saturable absorbers, standardized single-mode fibers, an erbium-doped fiber amplifier, and a ZBLAN fiber. Materials include the ZBLAN fluoride fiber and the single-mode fibers.
4：Experimental Procedures and Operational Workflow:
The mode-locked fiber laser generates pulses which are then amplified and passed through the ZBLAN fiber to generate SC. The spectral flatness is measured and optimized by adjusting the length of the single-mode fiber connected to the laser output.
5：Data Analysis Methods:
The performance of the optical spectrum is observed using an optical spectral analyzer. The pulse width and optical pulse trains are measured by a commercial autocorrelator and oscilloscope, respectively.
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