Plane Mirror Substrates (PM)
General purpose plane mirror blanks
- For first surface use. Second surface is commercial polish
- Apply any reflecting coating
These general-purpose mirror blanks are polished to < λ /10 flatness except where indicated otherwise. They are intended for front surface use and are parallel to within 3 arc min. These blanks are not recommended for use as transmitting optics as the rear surface is only commercially polished.
Surface Quality: |
< 10/5
< 40/20 for Sapphire |
Surface Flatness: |
< λ / 10 @ 633 nm
< λ / 2 @ 633nm for Sapphire |
Diameter Tolerance: |
<+ 0.00 / – 0.20 mm |
Thickness Tolerance: |
< ± 0.25 mm |
Clear Aperture: |
> 85% of diameter |
Parallelism: |
< 3 arc min |
Bevel: |
0.3 mm (typical) x 45° |
Plane Mirror Substrates (PM)