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Power meter parameter calculation
Remarks：
1. Calculation of spot parameters
2. Input parameters are required: spot diameter (cm), spot length (cm) and width (cm), single pulse energy (J), repetition rate (Hz) and pulse width (s).
3. Calculated parameters: spot area, energy density, 2 times of energy density, average power, power density, 2 times of power density, peak power, peak power density.
4. The light spot calculation is divided into circular and square, and the circular light spot can be filled in the light spot diameter; Fill in the length and width of the square light spot. Input according to the flare shape to be calculated. If both are filled in, the default is circle.
Input parameters:
Spot diameter(cm)： Square spot length(cm)： Width(cm)： Single pulse energy(J)： Repetition frequency(HZ)： Pulse width(s)： 光斑面积（cm²） 能量密度（J/cm²） 能量密度（2倍）（J/cm²） 平均功率（W） 功率密度（W/cm²） 功率密度（2倍）（W/cm²） 峰值功率（W） 峰值功率密度 （W/cm²）
