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 Single and Double Sided Optical Flats
Advanced Optics manufactures precision polished optical flats which may be used as a reference (test plate) against which the flatness of an unknown surface may be compared or as an optical window. We offer optical flats made of Pyrex, fused silica and Zerodur up to 8” in diameter to meet various demanding applications. Surface flatness of 1/4 wave, 1/10 wave and 1/20 wave are available in either fused silica or Zerodur and 1/4 wave and 1/10 wave in Pyrex. In addition to our in-stock optical flats, we offer custom fabrication to meet exact customer requirements.
Optical Flat Specifications
Many of Advanced Optics optical flats are manufactured out of synthetic fused silica which provides superior transmission characteristics, a high degree of purity, exceptional environmental durability, and a low coefficient of thermal expansion. Due to these attributes, our double sided optical flats may be used as optical windows. The accuracy of each optical flat is traceable to the National Institute of Standards and Technology.
Surface Accuracy
Single or Double Sided |
Diameter |
Fused Silica
Thickness |
1/20 wave (0.000001”) |
25.4 (1”) |
12.7 (1/2”) |
1/10 wave (0.000002”) |
25.4 (1”) |
12.7 (1/2”) |
1/20 wave (0.000001”) |
50.8 (2”) |
15.9 (5/8”) |
1/10 wave (0.000002”) |
50.8 (2”) |
15.9 (5/8”) |
1/20 wave (0.000001”) |
76.2 (3”) |
15.9 (5/8”) |
1/10 wave (0.000002”) |
76.2 (3”) |
15.9 (5/8”) |
1/20 wave (0.000001”) |
101.6 (4”) |
19.1 (3/4”) |
1/10 wave (0.000002”) |
101.6 (4”) |
19.1 (3/4”) |
1/20 wave (0.000001”) |
127 (5”) |
19.1 (3/4”) |
1/10 wave (0.000002”) |
127 (5”) |
19.1 (3/4”) |
1/20 wave (0.000001”) |
152.4 (6”) |
25.4 (1”) |
1/10 wave (0.000002”) |
152.4 (6”) |
25.4 (1”) |
1/20 wave (0.000001”) |
203.2 (8”) |
33.8 (1.33”) |
1/10 wave (0.000002”) |
203.2 (8”) |
33.8 (1.33”) |
 Fused Silica Technical Data Sheet from Corning Incorporated (pdf)
Double Surface Optical Flats/Optical Windows
Advanced Optics also offers double-surface optical flats for use as optical windows. As with our optical flats, our windows are 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. Both are provided either uncoated or with an anti-reflective coating. Advanced Optics dual-surface optical flats are an excellent choice when an optical system requires separation between two environments while passing a specific wavelength(s) of light or for demanding interferometry requirements.
Flatness Error of One Fringe
(1/2 wave)
(top view of optical flat) |
Test Piece
Perfectly Flat
(top view of optical flat) |
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