Recent content by shiweiliu

Oh. I estimated it according to formula: wavelength^2/Delta wavelength. Wavelength is about 500nm and Delta wavelength is about 300nm. It is about one micrometer. Something is wrong in my method?

I have an optical interference filter that is used to block (reflect) solar light heat between 800nm and 1100nm. That filter is made by using 200 layers of quarter wave high and low index coatings on plastic film. The total thickness of the coating is 25 micrometers or even 50 micrometers. I...