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An optical flat is a flat surface which is precisely polished. It can be used as a reference, against which the flatness of unknown surface may be compared. Measurement of the surface flatness of polished surfaces can be determined visually by comparing the variations between a work surface and the surface of an optical flat. These optical flats can be used in many applications, such as, inspecting of gauge blocks for wear and accuracy, as well as testing various components, including windows, prisms, filters, mirrors, etc. They can also be used as an extremely standard flat in interferometers. |
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| BTMT offers both single and dual surface optical flats in either BK7A or Fused silica. We offer two different levels of accuracy for our single surface flats: λ/10 and λ/20. For our dual surface flats, only λ/10 accuracy is available. |
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How to ensure the accuracy-1/10 Wave and 1/20 Wave
The primary surface of all the optical flats in BTMT can reach the stated accuracy by strictly grinding and polishing, and the surface can be tested and certified on our CXM150-1L Digital Phase-Shifting Interferometer. |
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Each optical flat is tested for flatness error using our CXM150-1L interferometer! |
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BTMT 1.2 m diameter marble continue polishing machines can ensure the surface accuracy! |
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| Material: |
NBK7A |
ZKN7 |
Fused Silica |
| Index of Refraction(587.6nm): |
1.5168 |
1.5080 |
1.4586 |
| Abbe Number(νd): |
64.20 |
61.05 |
68.00 |
| Density(g/cm3): |
2.52 |
2.43 |
2.21 |
| Coefficient of Expansion(-60℃― +20℃): |
66x per ℃ |
42x per ℃ |
2.1x per ℃ |
| Surface Quality: |
60/40 |
60/40 |
60/40 |
| Surface Accuracy: |
λ/10 &λ/20 |
λ/10 &λ/20 |
λ/10 &λ/20 |
| Back surface accuracy: |
See table |
See table |
See table |
| Parallelism: |
5-10 arcmin |
5-10 arcmin |
5-10 arcmin |
| Clear Aperture: |
>90% of central diameter |
>90% of central diameter |
>90% of central diameter |
| Bevel: |
1.0x45° |
1.0x45° |
1.0x45° |
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单面标准平面镜 |
Product Number |
Diameter |
Thickness |
Surface Acccurac |
Back Surface Accuracy |
Material |
TPOF-30B-A |
30±0.6 |
10.0±1.0 |
λ/20 |
λ |
NBK7A/H-K9L
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TPOF-30B-B |
30±0.6 |
10.0±1.0 |
λ/10 |
λ |
NBK7A/H-K9L
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TPOF-30Z-A |
30±0.6 |
10.0±1.0 |
λ/20 |
λ |
ZKN7/H-K4 |
TPOF-30Z-B |
30±0.6 |
10.0±1.0 |
λ/10 |
λ |
ZKN7/H-K4 |
TPOF-30U-A |
30±0.6 |
10.0±1.0 |
λ/20 |
λ |
Fused Silica/石英玻璃 |
TPOF-30U-B |
30±0.6 |
10.0±1.0 |
λ/10 |
λ |
Fused Silica/石英玻璃 |
TPOF-60B-A |
60±0.8 |
20.0±1.2 |
λ/20 |
2λ |
NBK7A/H-K9L
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TPOF-60B-B |
60±0.8 |
20.0±1.2 |
λ/10 |
2λ |
NBK7A/H-K9L
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TPOF-60Z-A |
60±0.8 |
20.0±1.2 |
λ/20 |
2λ |
ZKN7/H-K4 |
TPOF-60Z-B |
60±0.8 |
20.0±1.2 |
λ/10 |
2λ |
ZKN7/H-K4 |
TPOF-60U-A |
60±0.8 |
20.0±1.2 |
λ/20 |
2λ |
Fused Silica/石英玻璃 |
TPOF-60U-B |
60±0.8 |
20.0±1.2 |
λ/10 |
2λ |
Fused Silica/石英玻璃 |
TPOF-80Z-A |
80±0.8 |
20.0±1.2 |
λ/20 |
3λ |
ZKN7/H-K4 |
TPOF-80Z-B |
80±0.8 |
20.0±1.2 |
λ/10 |
3λ |
ZKN7/H-K4 |
TPOF-80U-A |
80±0.8 |
20.0±1.2 |
λ/20 |
3λ |
Fused Silica/石英玻璃 |
TPOF-80U-B |
80±0.8 |
20.0±1.2 |
λ/10 |
3λ |
Fused Silica/石英玻璃 |
TPOF-100Z-A |
100±1.0 |
25.0±1.5 |
λ/20 |
4λ |
ZKN7/H-K4 |
TPOF-100Z-B |
100±1.0 |
25.0±1.5 |
λ/10 |
4λ |
ZKN7/H-K4 |
TPOF-100U-A |
100±1.0 |
25.0±1.5 |
λ/20 |
4λ |
Fused Silica/石英玻璃 |
TPOF-100U-B |
100±1.0 |
25.0±1.5 |
λ/10 |
4λ |
Fused Silica/石英玻璃 |
TPOF-150Z-A |
150±1.0 |
30.0±1.6 |
λ/20 |
5λ |
ZKN7/H-K4 |
TPOF-150Z-B |
150±1.0 |
30.0±1.6 |
λ/10 |
5λ |
ZKN7/H-K4 |
TPOF-150U-A |
150±1.0 |
30.0±1.6 |
λ/20 |
5λ |
Fused Silica/石英玻璃 |
TPOF-150U-B |
150±1.0 |
30.0±1.6 |
λ/10 |
5λ |
Fused Silica/石英玻璃 |
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·The back surface of our single surface flats is only for viewing the interference pattern..
·All dimensions are in mm unless otherwise specified.
·Other size and dual surface optical flats are available upon requests. |
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