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Single sided optical flats may be used as a reference (test plate) against which the flatness of an unknown surface can be compared. Advanced Optics carries single sided fused silica optical flats up to 6” in diameter and polished to λ/10 and λ/20 in stock for immediate shipment.

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")

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

To order please call 262-548-1155 or Request a Quote.

Advanced Optics offers personalized service; saving you time and money by helping you select the best option for your application.

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.

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

Optical Flat Manufacturing Proficiencies

  • Achieve accuracies of ʎ/4, ʎ/10, and ʎ/20.
  • Provide various substrates, including fused silica, BOROFLOAT® 33, and ZERODUR®.
  • Attain parallelism < 2 arc seconds.
  • Yield surface quality to 10/5.
  • Furnish uncoated optical flats or offer coatings that enhance the interference pattern.
  • Supply custom coatings to meet individual requirements.
  • Produce custom flats and prototypes.
  • Maintain an optical flat resurfacing service with fast turnaround times.

Custom Optical Flats

In addition to a large selection of in-stock optical flats, Advanced Optics offers custom optical flats, as well as free engineering services. Our capabilities allow us to:

  • Fabricate optical flats from 1mm – 533mm.
  • Precision polish round, square, and rectangular substrates in almost any configuration.
  • Manufacture custom optical flats with features such as holes, bevels, or steps.

Whether you require one of our many catalog flats or need a custom optical flat, let Advanced Optics be your trusted partner - You can depend on our 100% outgoing inspection, on-time delivery, and unmatched customer service, all at competitive prices.

Optical Flat Resurfacing

Advanced Optics offers optical flat resurfacing for single sided flats. Optical flats 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