基于菲涅尔反射的光纤激光器功率测量方法

分析了光纤熔接点处的菲涅尔散射光模型,得出熔接点散射光功率与输出光功率成线性关系的结论。利用该结论设计了kW级光纤激光器的振荡器、泵浦源输出功率检测装置,并安装在某kW级光纤激光器上进行了实验。通过建立线性估计函数,利用最小二乘法对光纤熔接点的散射光功率与光纤激光器的振荡器、泵浦源输出功率的关系进行了拟合。通过实验验证了熔接点散射功率与光纤输出功率的线性关系。实验表明利用熔接点散射光功率间接测量光纤激光器输出功率的方法线性度优于4%。

Research on power measurement method of fiber laser based on Fresnel scattering

The Fresnel reflection light model of fiber splicing point was analyzed, and it was concluded that there is a linear relationship between the scattered light power of splicing point and output optical power. The oscillator and pump source power detecting device of a kW-class fiber laser were designed with this conclusion, and mounted on a kW-class fiber laser in experiments. Through the establishment of linear estimation function using the least squares method for the fiber splice scattered light power of fiber laser oscillator and pump source, the relationship between the output power and the fiber splice scattered light power of fiber was fitted. The linear relationship was verified by experiments. Experiments show that the linearity of the method using splice scattered light power indirect measurement of fiber laser output power wasless than 4%.