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All Products / Optics / Windows and Diffusers / Interferometry Windows / Single 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

25.4mm Dia. λ/20 Fused Silica Optical Flat

Optical Flats 1 Optical Flats 3
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Stock #43-408-000 3-4 days
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£155.55
Qty 1-10
£155.55
Qty 11+
£140.25
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Surface Flatness (P-V):
λ/20
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):
25.40 +0.00/-1.00
Thickness (mm):
12.70 ±1.5
Diameter (inches):
1.00 +0.00/-0.04
Thickness (inches):
0.50 ±0.06
Clear Aperture CA (mm):
22.90
Color:
Clear
Construction:
Single 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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Certificate of Conformance:
View
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Reach 240:
Compliant
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Product Family Description

  • Sizes Ranging from ½" Diameter to 14" Diameter
  • Each λ/20 Flat 76.2mm and Larger Includes a Certificate of Calibration
  • Available with Standard Metallic Mirror Coatings: λ/10 and λ/20 Mirrors

TECHSPEC® Single Surface Optical Flats are used as a reference (test plate) against which the flatness of an unknown surface may be compared. Each piece is precision polished by our master opticians and tested on a Zygo interferometer to insure the surface flatness. The secondary surfaces of our single surface flats are pitch polished to window quality for viewing the interference pattern. TECHSPEC Single Surface Optical Flats ship in a durable storage case for permanent protection. λ/20 flats that are 76.2mm or larger also include a certificate of calibration.