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Flat plates HR Mirrors
Every surface reflects light. The reflected light is
both diffuse and regular (or specular) and sometimes
comes both from the surface and the bulk material. The
reflectance of a surface with a dielectric coating depends
on the optical properties of both the substrate and
the coating.
Coating can be designed for very high reflectance or
as partial reflector. The useful wavelenght range of
any dielectic reflector is limited.
Specifications:
| Diameter Tolerence: |
+0mm - 0.2mm |
| Parallism: |
< 1 arc minute |
| Clear Aperture: |
> 80% |
| Thickness Tolerence: |
+/- 0.2mm |
| Wavefront Distortion: |
^/10@632.8 mm per 25 mm |
| Surface Quality: |
20/10 scratch and dig |
| Bevel: |
0.25mm x 45 degree |
Materials:
BKY grade A optical glass n = 1.5183 +/- 0.0005 (@546.1mm)
High purity uv grade fused silica n = 1.4608 +/- 0.0005
(@546.1mm)
Coating:
HR coating on S1, Rp> 99.5% for random polarisation
Rs> 99.9%, Rp> 99.2%
R= (Rs+Rp) / 2 uncoated on S2
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