Theory study of the second harmonic properties of broadband lasers

In the experiment of laser fusion, broadband lasers, which are weak interference, can effectively restrain high order nonlinear effects and smooth the radiation upon the target. According to the method of different frequency coupling,a model of the second harmonic generation (SHG) of the broadband lasers is set up. The calculation result shows that the bandwidth is compressed,which can be referenced by the third harmonic generation of the broadband lasers.