Optical Short-pass Filters are coated on a substrate of fused silica, which allows the transmission of any wavelength shorter than the cut-off wavelength and block any wavelength longer than the cut-off.
•Substrate: Fused silica
•Dimension Tolerance: +0/-0.2
•Thickness: 4+/-0.2
•Parallelism: <3‘
•Flatness: λ/4
•Surface Quality: 40-20 scratch-dig
•Clear Aperture: 90% Diameter
•Transmission: T≥85%
•Blocking: T≤1%