What are the Optical Glass Substrates for Filters?

Optical glass substrates of optical filters mainly include absorption glass, such as JB510, CB535, HB850, colorless optical glass K9, float glass, B270, fused quartz, etc.

Geometric dimensions and thickness: Considering the special application environment of customers and the need of mechanical layout in the system, the geometric size and thickness of optical filters should be specified, and the appropriate tolerance range should be given.

Characteristic: Different types of substrate materials have specific components and different physical or chemical properties. For example, temperature resistance, acid and alkali resistance, whether it has spontaneous fluorescence effect, expansion characteristics and stress characteristics, please select the appropriate substrate according to the use. The surface quality of the filter varies with the substrate.

So what does the surface quality of optical filters mean?

The surface quality of optical filters is an important characteristic of glass. The surface quality of our filters are manufactured according to the US Military Standard 40-20 and international three-level standards. Although surface quality usually does not affect the optical properties of filter products, it will affect the overall appearance of the product, and may become an important factor in the acceptance of customers. Certain types of glass are prone to surface corrosion or scratches. If customers need high quality glass substrates, the cost is usually higher. If customers do not require high surface quality, they can choose some cheap optical glass to obtain lower cost.