Study on diffraction losses of laser simulators

The divergence provided by the semiconductor laser are all defined at the point of half power.In practical calculation, it must be transformed to another define level and the measurement divergence of LOC laser is rather great.So the transformation formulas of divergence for a Gaussian beam are modified in this paper.According to the modification,the formulas of diffraction losses of the laser simulators are derived.As the examples,the diffraction losses of three types of laser simulators are calculated.