¨ Specifications:
¨ Material: SF11 grade A fine annealed optical glass
¨ Dimention Tolerance: +0.0,-0.15mm
¨ Clear aperture: >80% of the central area
¨ Surface quality: 60/40 scratch and dig
¨ Flatness: λ/8@830nm
¨ Coating: MgF2 single layer on perpendicular surface
¨ θ=29°7'+/-30''