“…When 𝐼 = 500𝑚𝐴, similarly, the refractive index increases slightly with the continuous increase of ion beam energy E; when 𝐼 = 1000𝑚𝐴, the refractive index also increases with the continuous increase of ion beam energy E, and the trend of flattening is more obvious. The change of refractive index reflects the density of the film to a certain extent [8] , and the higher the density of the film layer, the greater the corresponding refractive index [9] . It can be seen that the auxiliary ion source proposed in this paper can improve the density of the film layer to a certain extent, but because the ion source designed in this paper is a low energy ion source, its improvement in the density of the film layer is not obvious.…”