Round Precision Mirrors
 Round precision mirrors are available in three different materials to meet various demanding applications where a high degree of wavefront integrity is critical. All are Aluminum coated with a protective SiO overcoat. They are also available uncoated for use as windows or flats.
Target Grade - made of fine annealed Pyrex, a borosilicate glass, with a low coefficient of thermal expansion. Pyrex has a high resistance to temperature change and chemical corrosion.
Interferometer Grade - made of synthetic fused silica which provides superior transmission characteristics, a high degree of purity, exceptional environmental durability, and a low coefficient of thermal expansion.
Zerodur - made of a glass-ceramic material which is thermally more stable than fused silica.
Target Grade Specifications:
Diameter |
Thickness |
Flatness |
Flatness |
25.4mm |
6.2mm |
1/4 wave |
1/10 wave |
50.8mm |
9.5mm |
1/4 wave |
1/10 wave |
76.2mm |
12.7mm |
1/4 wave |
1/10 wave |
101.6mm |
15.8mm |
1/4 wave |
1/10 wave |
*152.4mm |
25.4mm |
1/4 wave |
1/10 wave |
*203.0mm |
33.8mm |
1/4 wave |
1/10 wave |
S1: Flatness specified at 633nm
60/40 scratch/dig, except where noted
S2: Fine ground
Diameter: +/-1.0mm
Thickness: +/-1.0mm
Material: Fine annealed Pyrex
* Standard 80/50 scratch/dig
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Interferometer Grade Specifications:
Diameter |
Thickness |
Flatness |
Flatness |
25.4mm |
12.7mm |
1/10 wave |
1/20 wave |
50.8mm |
15.9mm |
1/10 wave |
1/20 wave |
76.2mm |
15.9mm |
1/10 wave |
1/20 wave |
101.6mm |
19.1mm |
1/10 wave |
1/20 wave |
127.0mm |
19.1mm |
1/10 wave |
1/20 wave |
152.4mm |
25.4mm |
1/10 wave |
1/20 wave |
S1: Flatness specified at 633nm
60/40 scratch/dig
S2: Fine ground
Diameter: +/-0.5mm
Thickness: +/-0.5mm
Material: Fused silica
Zerodur:
Please call for a prompt quotation on your specifications.
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