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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

203.2mm Dia. λ/10 Fused Silica Optical Flat

Stock #31-390-000
Qty 1-2
€3,170.00
Qty 3+
€2,853.00
Volume Pricing
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Surface Flatness:
λ/10
Abbe Number (vd):
67.8
Clear Aperture CA (mm):
182.90
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):
203.20 +0.0/-0.51
Diameter (inches):
8.00 +0.0/-0.02
Thickness (inches):
1.50 ±0.10
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
Thickness (mm):
38.10 ±2.54
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
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:
Reach 211:

Product Family Description

  • Sizes Ranging from ½" Diameter to 12" Diameter
  • Each λ/20 Flat 75mm and Larger Includes a Certificate of Calibration
  • Available with Standard Metallic Mirror Coatings: λ/10 and λ/20 Mirrors

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. Each flat ships in a durable storage case for permanent protection. λ/20 flats that are 75mm or larger also include a certificate of calibration.

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