https://www.galvoptics.co.uk/optical-components/optical-windows/uv-fused-silica-windows---uv-ar-250-400nm/
UV Fused Silica windows AR coated 250~400nm - Galvoptics
AR coated UV fused silica windows 250 ~ 400nm AR ultraviolet coated
fused silica windowsar coateduv