Optical Flats, Dual Precision Surface



G1 Optical Grade Fused Quartz

Diameter Tolerance

+/- 0.125 mm

Thickness Tolerance

+/- 0.125 mm



Surface Quality

60-40, scratch-dig

Clear Aperture


Optical Flats, Dual Precision Surface

Esco PN:
  • $ 15400

Optical Flats are most commonly used as test plates to evaluate the accuracy of unknown optical surfaces. Esco manufactures optical flats out of G1 grade fused quartz; the low thermal expansion, abrasion resistance and general stability of this material allows continuous use with minimal degradation over time.

Esco offers optical flats with either one or two precision surfaces. Customers can test flat optical surfaces by holding the precision of an optical flat against the test surface. When placed under a monochromatic light, a fringe pattern can be seen through the back surface of the flat. This pattern describes the contour of the test surface, and is not affected by the accuracy of the rear surface.


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American Owned & Operated

Esco Optics is a leading manufacturer of custom and catalog optics, precision optical components, and ITAR optics in the United States.

Military & Defense Supplier

As the leader for military and defense optics in the United States, Esco Optics adheres to the International Traffic in Arms Regulations.

ITAR Registered & Compliant

ITAR registered and compliant, Esco manufactures ITAR optics for all of its customers with the strictest confidentiality.