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All Products / Optics / Windows and Diffusers / Interferometry Windows / Precision Dual Surface Optical Flats
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

3" Dia. λ/10 Fused Silica Dual Surface Flat

Optical Flats 1 Optical Flats 3
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Stock #43-428 3-5 days
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A$676.80 A$1,128.00
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A$676.80 A$1,128.00
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Surface Flatness (P-V):
λ/10
Abbe Number (vd):
67.8
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
0.52 (+5 to +35°C)
0.57 (0 to +200°C)
0.48 (-100 to +200°C)
Diameter (mm):
76.20 ±1.0
Thickness (mm):
19.05 ±1.5
Diameter (inches):
3.00 ±0.04
Thickness (inches):
0.75 ±0.06
Clear Aperture CA (mm):
68.60
Construction:
Dual Surface
Density (g/cm3):
2.20
Index of Refraction nd:
1.458
Knoop Hardness (kg/mm2):
522
Parallelism (arcmin):
<3
Poisson's Ratio:
0.16
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica
Surface Quality:
60-40
Type:
Interferometry Window
Wavelength Range (nm):
200 - 2200
Young's Modulus (GPa):
73
Bevel:
Protective as needed

Regulatory Compliance

RoHS 2015:
Compliant
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Reach 209:
Compliant
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Certificate of Conformance:
View
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Product Family Description

  • λ/10 and λ/20 Surface Flatness Options
  • Each λ/20 Flat 76.2mm and Larger Includes a Certificate of Calibration
  • Extended Lifetime in Contact Measurement Applications
  • Single Surface Optical Flats Also Available

TECHSPEC® Precision Dual Surface Optical Flats are precision ground and polished to the stated accuracies on both surfaces so that either face may be used for test applications. Both surfaces are tested and certified by our Zygo Interferometer. Each flat ships in a durable storage case for permanent protection. TECHSPEC® Precision Dual Surface Optical Flats specified for λ/20 flatness that are 76.2mm or larger also include a certificate of calibration. These dual surface flats are uncoated and offered in diameters ranging from 25.40 to 304.80mm.