Diameter: from 0.5mm to 2500mm,Surface Quality: 10-5 S/D... Material::BK7, fused silica, borofloate, CaF2, MgF2, Ge, Si, ZnSe, ZnS, SF, LaF, BaK... Coating: AR coating,Al/Au reflective coating,BBAR coating,DLC coating,Dielectric HR coating... Application: In the field of Defence,Imaging,medical,laser,sensor,Biochemical.. Features: Optical bandpass filters transmit light only within a defined spectral band ranging from less than one to many nanometers wide. Benefits: a. Long Band Pass b. Sort Band Pass c. Narrow FWHM d. High Transmission We believe that Optical bandpass filters offers an unbeatable combination of quality, performance, and value. If you have any questions about this product or would like to learn more about how it can benefit your business, please don't hesitate to contact us. We are dedicated to providing excellent customer service and helping our customers achieve their business goals. Thank you for considering Optical bandpass filters. We look forward to the opportunity to work with you and help you achieve success.