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Optical flats are versatile optical components used in many applications, such as: |
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inspection of gauge blocks for wear and accuracy, |
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as well as the testing of various components including windows, prisms, filters, mirrors, etc. |
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They can also be used as extremely flat optical windows for demanding interferometry requirements. |
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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
| Material | UVFS |
| Diameter Tolerance | +0.0, -0.12 mm |
| Thickness Tolerance | ±0.2 mm |
| S1 Surface Flatness | λ/20 @ 633 nm |
| S2 Surface Flatness | 2 λ @ 633 nm |
| AR Coatings | None. Please refer to the Coating Section |
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Optical Flats
| Diameter, mm | Thickness, mm | Ordering Code |
| 25.4 | 8 | 14OF-1 |
| 25 | 8 | 14OF-25 |
| 38.1 | 10 | 14OF-1.5 |
| 40 | 10 | 14OF-40 |
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Related product
4OCM-25 - Optical Component Mount
Ordering
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