|
|
Substrate
Material
|
BK7,
F2, UV grade fused silica or Quartz etc. |
Surface
Figure
|
λ/4
at 633㎚ |
Surface
Quality
|
40-20 |
Thickness
Tolerance
|
±0.3㎜ |
Chamfer
|
0.30㎜
at 45˚ typical |
Concentricity
|
≤
0.05㎜ |
Dimensional
Tolerance
|
+0.0㎜,
-0.3㎜ |
Antireflection
Coating
|
User
specified, R≤0.25% |
Focal
Length Tolerance
|
±0.6% |
Clear
Aperture
|
Exceeds
central 85% of dimension |
|
|
