We are offering optical dielectric mirrors. *dielectric mirrors offer near total reflection, minimizing losses in nearly all optical systems. These coatings are very durable, easily cleaned, and resistant to laser damage. available either broadband or narrowband, they operate efficiently over 045angle of incidence: aoi=0, r>99.8%; aoi=45, r>99.5% (rs>99.9%, rp>99.2%). *specifications: material: n-bk7 ; uv fused silica ;other optical glassdimension tolerance: +0.0, -0.1mmthickness tolerance: 0.1mmsurface quality: 60/40(standard), 10/5(high precision)clear aperture: >85%flatness: /4 per 25mm@633nmparallelism: