Specifications include, but are not limited to: Comments OAP 2A&B same ROC different OAD, OAP 4&5 same ROC & OAD different diameter Material ULE or Zerodur or ClearCeram-Z: same substrate for all mirrors Diameter [mm] 50.0 +0 / -0.1 25.4 +0 / -0.1 (exception for OAP 2A & 5, see Figures 4 & 9) Center Thickness [mm] 25.0 0.25 12.7 0.25 Clear Aperture [%] > 85 Radius of Curvature [mm] 1000.2 0.1% 200 0.1% 3A: 142 0.1% 3B: 292 0.1% 200 0.1% 200 0.1% Conic Constant -1.000 Center-to-Center Off-Axis Distance [mm] 136.4 2A: 30.0 2B: 20.0 3A: 34.2 3B: 55.2 72.0 72.0 Wavefront Error [nm RMS] 2 Surface 2D PSD (ABC model) A = 4.14E-3 nm2 /(c/m)2 , B = 10 c/m, C = 2.65 Surface Quality 10-5 Surface Roughness [nm] < 1 Coating Type Protected aluminum (AlMgF2), no enhancement layers Coating Angle of Incidence [°] 0 – 20 Coating Waveband [nm] 400 – 750 Average Reflectance [%] > 90 Absolute Reflectance [%] > 85 Bevel 0.5 mm x 45˚ Parent Vertex Scribe Lines Mark thin and thick edges with etched scribe line pointing to parent vertex axis, ± 0.5° Edge Surface Finish Ground Back Surface Polish Inspection-level Quantity 2 2 & 2 2 & 2 3