Cut Off Filter

We are offering cut off filter. it can filter out all long or short wavelength and only keep the range of band which is required.it includes two types, shortpass cut-off filter and longpass cut-off filter.the former can kept long wave and filt out the light which is radiated by all the shortwave, the latter instead. specification material k9 or quartz glass diameter tolerance +0/-0.1mm thickness tolerance ±0.1mm surface quality 40-20 parallelism