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Ocean Optics - Inventor of the World's First Miniature Spectrometer
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Precision Optical Flats
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An Ocean
Optics Optical Flat is a finely polished flat surface used as a
reference against which the flatness of a test surface may be
compared. We offer single-sided optical flats in either fused silica
or Zerodur®.
Additionally, the flats can be enhanced
with an aluminum coating to increase contrast and improve the visual
reference. Starting at $200, our 32 different flats range in size from
1" to 6" in diameter and
are available in 1/20 wave, 1/10 wave or 1/4 wave flatness accuracies. |
Features
,
1/10l or 1/4l
accuracies
Optional aluminum coating
increases contrast
Ocean Optics Optical Flats can be used to visually
inspect optical components such as mirrors, filters, prisms and
windows.
When an Ocean Optics Optical Flat is placed in contact
with a test surface and viewed with a monochromatic light, an interference
pattern of light and dark bands is formed. The shape of this interference
pattern provides an accurate visual representation of the flatness of the
test surface. A curved interference pattern indicates that the flatness of the
test surface is less than that of the reference surface. Evenly spaced
interference patterns indicate that the test surface is equal to or higher
than that of the reference surface.
Flatness Error of One Fringe (1/2l)
(top view of optical flat) |
Test Piece Flat
(top view of optical flat) |
Based on the application requirements, users can choose
between 1/20l ,
1/10l and 1/4l
accuracies. For instance, if the test surface is flatter than 1/4l
, then a more precise 1/10l
flat is required to display a change in the interference pattern.
Users can also choose between flats made of fused silica
or Zerodur.
Fused silica has a low thermal expansion of 0.55 x 10-6
per ºC and is highly resistant to abrasions. Zerodur
is a yellow-tinted clear glass ceramic that exhibits a low thermal
expansion of 0.10 x 10-6
per ºC.
Optical flats can lose their degree of
precision with repeated use. Ocean Optics can recalibrate and repolish
your Ocean Optics Optical Flat for a small fee. Please contact an Applications
Scientist for more information on this service.
Single-sided Optical Flats - 1/10l
| Item
Code |
Diameter |
Center
Thickness |
Material |
Flatness |
Price |
| FLS-10-SS |
1.0" |
0.5" |
Fused
Silica |
1/10l |
$65 |
| FLZ-10-SS |
1.0" |
0.5" |
Zerodur |
1/10l |
$78 |
| FLS-20-SS |
2.0" |
0.5" |
Fused
Silica |
1/10l |
$100 |
| FLZ-20-SS |
2.0" |
0.5" |
Zerodur |
1/10l |
$100 |
| FLS-40-SS |
4.0" |
0.75" |
Fused
Silica |
1/10l |
$275 |
| FLZ-40-SS |
4.0" |
0.75" |
Zerodur |
1/10l |
$395 |
| FLS-60-SS |
6.0" |
1.0" |
Fused
Silica |
1/10l |
$525 |
| FLZ-60-SS |
6.0" |
1.0" |
Zerodur |
1/10l |
$744 |
Single-sided Optical Flats - 1/20l
| Item
Code |
Diameter |
Center
Thickness |
Material |
Flatness |
Price |
| FLS-12-SS |
1.0" |
0.5" |
Fused
Silica |
1/20l |
$95 |
| FLZ-12-SS |
1.0" |
0.5" |
Zerodur |
1/20l |
$108 |
| FLS-22-SS |
2.0" |
0.5" |
Fused
Silica |
1/20l |
$125 |
| FLZ-22-SS |
2.0" |
0.5" |
Zerodur |
1/20l |
$125 |
| FLS-42-SS |
4.0" |
0.75" |
Fused
Silica |
1/20l |
$325 |
| FLZ-42-SS |
4.0" |
0.75" |
Zerodur |
1/20l |
$445 |
| FLS-62-SS |
6.0" |
1.0" |
Fused
Silica |
1/20l |
$715 |
| FLZ-62-SS |
6.0" |
1.0" |
Zerodur |
1/20l |
$934 |
Single-sided Optical Flats - 1/4l
| Item
Code |
Diameter |
Center
Thickness |
Material |
Flatness |
Price |
| FLS-14-SS |
1.0" |
0.5" |
Fused
Silica |
1/4l |
$45 |
| FLZ-14-SS |
1.0" |
0.5" |
Zerodur |
1/4l |
$58 |
| FLS-24-SS |
2.0" |
0.5" |
Fused
Silica |
1/4l |
$65 |
| FLZ-24-SS |
2.0" |
0.5" |
Zerodur |
1/4l |
$65 |
| FLS-44-SS |
4.0" |
0.75" |
Fused
Silica |
1/4l |
$225 |
| FLZ-44-SS |
4.0" |
0.75" |
Zerodur |
1/4l |
$345 |
| FLS-64-SS |
6.0" |
1.0" |
Fused
Silica |
1/4l |
$450 |
| FLZ-64-SS |
6.0" |
1.0" |
Zerodur |
1/4l |
$669 |
Aluminum-enhanced Single-sided Optical
Flats - 1/10l
| Item
Code |
Diameter |
Center
Thickness |
Material |
Flatness |
Price |
| FLS-10-SSM |
1.0" |
0.5" |
Fused
Silica |
1/10l |
$132 |
| FLZ-10-SSM |
1.0" |
0.5" |
Zerodur |
1/10l |
$146 |
| FLS-20-SSM |
2.0" |
0.5" |
Fused
Silica |
1/10l |
$220 |
| FLZ-20-SSM |
2.0" |
0.5" |
Zerodur |
1/10l |
$226 |
| FLS-40-SSM |
4.0" |
0.75" |
Fused
Silica |
1/10l |
$858 |
| FLZ-40-SSM |
4.0" |
0.75" |
Zerodur |
1/10l |
$858 |
| FLS-60-SSM |
6.0" |
1.0" |
Fused
Silica |
1/10l |
$1470 |
| FLZ-60-SSM |
6.0" |
1.0" |
Zerodur |
1/10l |
$1572 |
Aluminum-enhanced Single-sided Optical
Flats - 1/20l
| Item
Code |
Diameter |
Center
Thickness |
Material |
Flatness |
Price |
| FLS-12-SSM |
1.0" |
0.5" |
Fused
Silica |
1/20l |
$170 |
| FLZ-12-SSM |
1.0" |
0.5" |
Zerodur |
1/20l |
$176 |
| FLS-22-SSM |
2.0" |
0.5" |
Fused
Silica |
1/20l |
$298 |
| FLZ-22-SSM |
2.0" |
0.5" |
Zerodur |
1/20l |
$328 |
| FLS-42-SSM |
4.0" |
0.75" |
Fused
Silica |
1/20l |
$912 |
| FLZ-42-SSM |
4.0" |
0.75" |
Zerodur |
1/20l |
$960 |
| FLS-62-SSM |
6.0" |
1.0" |
Fused
Silica |
1/20l |
$2136 |
| FLZ-62-SSM |
6.0" |
1.0" |
Zerodur |
1/20l |
$2238 |
Aluminum-enhanced Single-sided Optical
Flats - 1/4l
| Item
Code |
Diameter |
Center
Thickness |
Material |
Flatness |
Price |
| FLS-14-SSM |
1.0" |
0.5" |
Fused
Silica |
1/4l |
$130 |
| FLZ-14-SSM |
1.0" |
0.5" |
Zerodur |
1/4l |
$130 |
| FLS-24-SSM |
2.0" |
0.5" |
Fused
Silica |
1/4l |
$182 |
| FLZ-24-SSM |
2.0" |
0.5" |
Zerodur |
1/4l |
$202 |
| FLS-44-SSM |
4.0" |
0.75" |
Fused
Silica |
1/4l |
$648 |
| FLZ-44-SSM |
4.0" |
0.75" |
Zerodur |
1/4l |
$708 |
| FLS-64-SSM |
6.0" |
1.0" |
Fused
Silica |
1/4l |
$1218 |
| FLZ-64-SSM |
6.0" |
1.0" |
Zerodur |
1/4l |
$1314 |
Optical
Flats Specifications
| Surface
Quality: |
60-40 |
| Wedge: |
<5.0' |
| Tolerance
on CT: |
+/-
0.04" |
| Tolerance
on Diameter: |
+/-
0.01" |
Material Specifications
| |
Fused
Silica |
Zerodur® |
| Refractive
Index: |
1.458nd |
1.542nd |
| Abbe
#: |
67.7vd |
56.2vd |
| Density: |
2.20
g/cm3 |
2.53
g/cm3 |
| Exp.
Coefficient: |
0.55 x
10-6 per 1/C |
0.10 x
10-6 per 1/C |
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Contact
an Ocean Optics Applications Scientist
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