Ocean Optics - Inventor of the World's First Miniature Spectrometer
Ocean Optics - Inventor of the World's First Miniature Spectrometer
 

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Ocean Optics - Inventor of the World's First Miniature Spectrometer

 

Precision Optical Flats

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

  • Easy-to-use

  • Provides immediate results

  • Available in 1/20l, 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 C 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 C.

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 $165
FLZ-10-SS 1.0" 0.5" Zerodur 1/10l $178
FLS-20-SS 2.0" 0.5" Fused Silica 1/10l $200
FLZ-20-SS 2.0" 0.5" Zerodur 1/10l $200
FLS-40-SS 4.0" 0.75" Fused Silica 1/10l $375
FLZ-40-SS 4.0" 0.75" Zerodur 1/10l $495
FLS-60-SS 6.0" 1.0" Fused Silica 1/10l $625
FLZ-60-SS 6.0" 1.0" Zerodur 1/10l $844

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 $195
FLZ-12-SS 1.0" 0.5" Zerodur 1/20l $208
FLS-22-SS 2.0" 0.5" Fused Silica 1/20l $225
FLZ-22-SS 2.0" 0.5" Zerodur 1/20l $225
FLS-42-SS 4.0" 0.75" Fused Silica 1/20l $425
FLZ-42-SS 4.0" 0.75" Zerodur 1/20l $545
FLS-62-SS 6.0" 1.0" Fused Silica 1/20l $815
FLZ-62-SS 6.0" 1.0" Zerodur 1/20l $1034

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 $145
FLZ-14-SS 1.0" 0.5" Zerodur 1/4l $158
FLS-24-SS 2.0" 0.5" Fused Silica 1/4l $165
FLZ-24-SS 2.0" 0.5" Zerodur 1/4l $165
FLS-44-SS 4.0" 0.75" Fused Silica 1/4l $325
FLZ-44-SS 4.0" 0.75" Zerodur 1/4l $445
FLS-64-SS 6.0" 1.0" Fused Silica 1/4l $550
FLZ-64-SS 6.0" 1.0" Zerodur 1/4l $769

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 $232
FLZ-10-SSM 1.0" 0.5" Zerodur 1/10l $246
FLS-20-SSM 2.0" 0.5" Fused Silica 1/10l $320
FLZ-20-SSM 2.0" 0.5" Zerodur 1/10l $326
FLS-40-SSM 4.0" 0.75" Fused Silica 1/10l $958
FLZ-40-SSM 4.0" 0.75" Zerodur 1/10l $958
FLS-60-SSM 6.0" 1.0" Fused Silica 1/10l $1570
FLZ-60-SSM 6.0" 1.0" Zerodur 1/10l $1672

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 $270
FLZ-12-SSM 1.0" 0.5" Zerodur 1/20l $276
FLS-22-SSM 2.0" 0.5" Fused Silica 1/20l $398
FLZ-22-SSM 2.0" 0.5" Zerodur 1/20l $428
FLS-42-SSM 4.0" 0.75" Fused Silica 1/20l $1012
FLZ-42-SSM 4.0" 0.75" Zerodur 1/20l $1060
FLS-62-SSM 6.0" 1.0" Fused Silica 1/20l $2236
FLZ-62-SSM 6.0" 1.0" Zerodur 1/20l $2338

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 $230
FLZ-14-SSM 1.0" 0.5" Zerodur 1/4l $230
FLS-24-SSM 2.0" 0.5" Fused Silica 1/4l $282
FLZ-24-SSM 2.0" 0.5" Zerodur 1/4l $302
FLS-44-SSM 4.0" 0.75" Fused Silica 1/4l $748
FLZ-44-SSM 4.0" 0.75" Zerodur 1/4l $808
FLS-64-SSM 6.0" 1.0" Fused Silica 1/4l $1318
FLZ-64-SSM 6.0" 1.0" Zerodur 1/4l $1414

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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