The Influence of the Kerr Effect on the Gaussian Beam Quality Factorand Its Reduce
克尔效应对高斯光束质量M2因子的影响及抑制

The process of the Gaussian beam propagating through the nonlinear medium is calculated by step FFT, and the M2 factor is get by minimizing the root-mean-square of the quadratic curve, the simulation results show: on the condition that the B integral is no more than 2, the stronger the Kerr effect is, and the bigger the M2 factor is; and in which the beam width and the length between the waist plane and the nonlinear medium are two important factors on the influence between the Kerr effect and M2 factor, namely the narrower beam width and the longer length are, the and the bigger the M2 factors are. The compensation adopting the negative nonlinear refractive index medium to reduce the Kerr effect is studied and the beam quality is improved effectively. The both side compensation is selected as an idea method in the three types of methods.