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Single sided optical flats are used as a reference (test plate) against which the flatness of an unknown surface can be compared. Advanced Optics offers single sided optical flats made of low expansion borosilicate glass, fused silica, fused quartz and ZERODUR® up to 8 inches in diameter. Surface flatness of λ/4, λ/10 and λ/20 are available in fused silica, fused quartz or ZERODUR© and λ/4 and λ/10 in low expansion borosilicate glass.

Optical Flat Specifications:

Many of our 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 can be used as an optical window. In addition to our in-stock optical flats, we offer custom fabricated optical flats to meet exact customer requirements.

The accuracy of each optical flat is traceable to the National Institute of Standards and Technology.

View our in-stock single sided optical flats below:

Surface Accuracy: Single Side Diameter Fused Silica (Thickness)
λ/20 (0.000001") 25.4 (1") 12.7 (1/2")
λ/10 (0.000002") 25.4 (1") 12.7 (1/2")
λ/20 (0.000001") 50.8 (2") 15.9 (5/8")
λ/10 (0.000002") 50.8 (2") 15.9 (5/8")
λ/20 (0.000001") 76.2 (3") 15.9 (5/8")
λ/10 (0.000002") 76.2 (3") 15.9 (5/8")
λ/20 (0.000001") 101.6 (4") 19.1 (3/4")
λ/10 (0.000002") 101.6 (4") 19.1 (3/4")
λ/20 (0.000001") 127 (5") 19.1 (3/4")
λ/10 (0.000002") 127 (5") 19.1 (3/4")
λ/20 (0.000001") 152.4 (6") 25.4 (1")
λ/10 (0.000002") 152.4 (6") 25.4 (1")
λ/20 (0.000001") 203.2 (8") 33.8 (1.33")
λ/10 (0.000002") 203.2 (8") 33.8 (1.33")

Fused Silica Technical Data Sheet from Corning Incorporated Fused Silica Technical Data Sheet from Corning Incorporated (pdf)

Advanced Optics offers optical flat resurfacing for single sided optical flats. Optical flats and optical windows become worn and abraded in use and accuracy is lost. This degradation in performance is due to a decrease in the distinctness of the interference pattern, and to a change in figure caused by scratches. Repolishing the surface of the optical flat back to its original accuracy can be less costly than replacement. Advanced Optics maintains an optical flat refinishing service with fast turnaround time.

Flatness Error of One Fringe (1/2 wave)
(top view of optical flat)
Test Piece Perfectly Flat
(top view of optical flat)

Have a question? Give us call and tell us about your project. (262) 548-1155