Development Of The Ultraviolet And Visible Telescope System Filters

This topic research is the filters of ultraviolet and visible telescope system. To meet the requirement of filters, through the comparative study on several kinds of the common materials used in ultraviolet areas, HfO2and MgF2are selected as the high and low refractive index materials. The film stack is got through the film pile being stacked based on the theory of the design, combining with the needle optimization, and designing the filter of the film. In the preparation of the film, the absorption is reduced by optimizing the parameters, and also the quality improved with ion-assisted deposition used, the film thickness control accuracy has been improved by means of parameters accurately control.The coatings on a diameter of210mm quartz substrates are made to meet the following characteristics:the reflectance at254nm is greater than95%while the average transmittance in280nm-600nm is greater than98. which can also applies to angle range from12°to30°meanwhile. The results show that the preparation of filter meets the requirements well.