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%.