“…From the table, it has been concluded that, in a certain range, with the increase of deposition rate or substrate temperature, vacuum degree, either ion beam density of ion source, the refractive index of H4 and SiO2 will be increased too [10][11] . The reason is that proper increase of deposition rate, substrate temperature ,vacuum degree and ion beam density of ion source can enhance the rate of film-forming particles at the surface of film ,compact the coating, enhance the refractive index of materials.…”