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Home > Optical substrates > 14OF - Optical flats
optical flats
Optical flats are versatile optical components used in many applications, such as:
inspection of gauge blocks for wear and accuracy,
as well as the testing of various components including windows, prisms, filters, mirrors, etc.
They can also be used as extremely flat optical windows for demanding interferometry requirements.


Optical flats - precisely polished optical grade substrates used for testing and evaluating the surface flatness of other optical components. When an optical flat is placed on another surface and illuminated with monochromatic light, the light waves reflect off both - the bottom surface of the flat and the surface it is resting on. The reflected waves interfere, creating a pattern of interference fringes (Newton's rings), visible as light and dark bands. If the surface of the optical flat is significantly flatter than the surface that is being evaluated, it is correct to interpret the interference pattern directly as a contour map of the surface being evaluated. If the flat is used on the top of the object, and interference pattern viewed through the flat, it is advantageous to have an anti-reflection coating on the top surface of the flat (the surface which does not touch the object being evaluated). For appropriate AR coating please refer to the Coatings section.

Standard Specifications
Diameter Tolerance+0.0, -0.12 mm
Thickness Tolerance±0.2 mm
S1 Surface Flatnessλ/20 @ 633 nm
S2 Surface Flatness2 λ @ 633 nm
AR CoatingsNone. Please refer to the Coating Section
  Optical Flats
Diameter, mmThickness, mmOrdering Code

Related product

- Optical Component Mount