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采用有限元法对实验室自制的非线性微结构光纤进行理论分析,表明该光纤具有良好的非线性和色散波产生的相位匹配特性.为实现微结构光纤非线性的全光纤化,本实验采用中心波长为1032 nm的光纤飞秒激光器作为抽运源,获得了753—789 nm的近红外色散波.实验中发现色散波中心波长和带宽随着抽运功率的改变会产生明显变化,并且在不同光纤长度时,色散波的频移量不同,脉冲展宽及频谱也会有明显的变化.实验结果与理论分析一致.这些结果对实现微结构光纤非线性的全光纤化具有良好的借鉴作用,为生物医疗应用特别是非线性光学显微成像术的近红外光源研究打下基础.
The finite element method is used to analyze the nonlinear microstructured fiber made in laboratory, which shows that the fiber has good nonlinearity and the phase matching characteristic of dispersion wave.In order to realize the non-linear all-fiber of microstructured fiber, The center of the wavelength of 1032 nm optical fiber femtosecond laser as a pump source, obtained 753-789 nm near-infrared dispersion wave. The experiment found that the center wavelength and bandwidth of the dispersion wave with the pumping power changes will have significant changes, and in Different fiber length, the frequency shift of the dispersion wave is different, pulse broadening and spectrum will have obvious changes.The experimental results are consistent with the theoretical analysis.These results have a good reference for the realization of all-fiber non-linear optical fiber microstructure, It laid the foundation for the research of near infrared light source in biomedical applications, especially non-linear optical microscopy.