Fig. 1. Power measurement system of ultra-high power fiber laser. (a) Schematic diagram;(b) on-site photo

Fig. 2. Measurement results under different power levels. (a) Repeated measurement results under 50-150 kW laser power levels; (b) measurement result under 200 kW laser power level with highest power test result shown in inset

Fig. 3. Measurement uncertainty values under different laser powers