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光纤激光系统功率放大过程中会形成非线性、多模耦合效应,降低系统峰值功率以及光束质量,为了增强功率放大光纤激光系统性能,分析大模场光纤下差异折射率、掺杂离子分布和光纤完全对光模式分布、模场面积、模式增益以及模式损耗的干扰,完善增益光纤的折射率以及掺杂离子分布,增强光纤模场面积、基模光束的增益以及模场抗弯曲畸变性能,然后设计了高斯复合型双包层增益光纤结构,提高光纤激光系统输出光束质量以及峰值功率。采用具体实验对光纤激光系统实施弯曲选模实验,验证该方法的高斯复合型双包层增益光纤在峰值功率以及输出光束质量上都有显著提升。
In the process of power amplification of fiber laser system, a nonlinear and multimode coupling effect is formed, which reduces the system peak power and the beam quality. In order to enhance the performance of the power amplifier fiber laser system, the differential refractive index, doping ion distribution and fiber Completely interfere with the light mode distribution, mode field area, mode gain and mode loss, improve the refractive index of the gain fiber and the doping ion distribution, enhance the mode field of the fiber, the gain of the fundamental mode beam and the distortion resistance of the mode field, Gaussian composite double-clad gain fiber structure is designed to improve the output beam quality and peak power of the fiber laser system. The experimental results show that the Gaussian composite double-cladding gain fiber has a significant improvement in peak power and output beam quality.