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OPTICAL FLATS - Single & Double Sided Flats

  • Optical flats precision polished up to 8" in diameter
  • Accuracy of λ/4, λ/10 or λ/20 available, many in stock for immediate shipment
  • Each optical flat comes with a Certificate of Calibration traceable to the NIST
  • Available uncoated or with an anti-reflective coating
  • Custom sizes, coatings, drilling and beveling available upon request with free engineering service.
  • Our optical flats are excellent for use as a reference (test plate) against which the flatness of an unknown surface may be compared or as optical windows.

Optical Flat Specification

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. Optical flats also available in low expansion borosilicate glass and ZERODUR®. See our available selection of fused silica flats below.

Surface Accuracy: Single or Double Sided Flat 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")

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

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

Optical Flats

Double Surface Optical Flat/Optical Windows

Advanced Optics also offers double-surface optical flats for use as optical windows. Our optical flats, as well as our optical 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. 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)

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