| Substrate Material: |
Schott NBK7 optical glass |
| Wavelength Range: |
350 - 2000nm |
| Design Wavelength: |
1570nm(plano-convex, spherical) |
| Outer Diameter(OD): |
25.4,-0.10/-0.05mm |
| Center Thickness(CT): |
4.00,+/-0.05mm |
| Edge Thickness(ET): |
2.83,+/-0.05mm |
| Radius of Curvature(R1) |
69.80,+/-0.05mm |
| Radius of Curvature(R2) |
flat |
| Effective Focal Length(EFL): |
+139.5mm designed @ 1570nm |
| Back Focal Length(BFL): |
+136.8mm @ 1570nm |
| Surface Quality: |
40/20 scratch and dig |
| Surface Figure: |
< lambda/4 @ 633nm inspected (over clear aperture) |
| Clear Aperture: |
>90% |
| Centration: |
<0.05mm |
| Coating(both surfaces): |
AR coated @1510-1650nm, R<0.25% (double surfaces, 0-deg AOI) |
| Bevel: |
0.20mm, 40-50 degrees |  |