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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

1" Dia. λ/20 Fused Silica Dual Surface Flat

Optical Flats 1 Optical Flats 3
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Stock #48-129 3-5 days
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A$502.64
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A$502.64
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Specifications

General

Type:
Interferometry Window

Physical & Mechanical Properties

Clear Aperture CA (mm):
22.90
Diameter (inches):
1.00 ±0.04
Diameter (mm):
25.40 ±1.0
Thickness (inches):
0.50 ±0.06
Thickness (mm):
12.70 ±1.5
Bevel:
Protective as needed
Construction:
Dual Surface
Edges:
Fine Ground
Parallelism (arcsec):
≤30
Poisson's Ratio:
0.16
Young's Modulus (GPa):
73
Knoop Hardness (kg/mm2):
522

Optical Properties

Coating:
Uncoated
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica (Corning 7980)
Index of Refraction (nd):
1.458
Surface Quality:
60-40
Abbe Number (vd):
67.8
Wavelength Range (nm):
200 - 2200
Surface Flatness (P-V):
λ/20

Material Properties

Density (g/cm3):
2.20
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)

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 247:
Compliant
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Product Details

  • 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.

Compatible Mounts