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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

203.2mm Dia. λ/20 ZERODUR® Optical Flat

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Stock #49-049-000 3-5 days
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Surface Flatness (P-V):
λ/20
Abbe Number (vd):
56.2
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
0.1
Diameter (mm):
203.20 +0.00/-1.00
Thickness (mm):
38.10 ±2.5
Diameter (inches):
8.00 +0.00/-0.04
Thickness (inches):
1.50 ±0.10
Clear Aperture CA (mm):
182.90
Color:
Yellow Tint
Construction:
Single Surface
Density (g/cm3):
2.53
Index of Refraction nd:
1.542
Knoop Hardness (kg/mm2):
620
Parallelism (arcmin):
≤3
Poisson's Ratio:
0.24
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Quality:
60-40
Type:
Interferometry Window
Young's Modulus (GPa):
90.3
Bevel:
Protective as needed

Regulatory Compliance

RoHS 2015:
Reach 211:
Certificate of Conformance:

Product Description

λ/20 flats include a certificate of calibration.

Product Family Description

  • Sizes Ranging from ½" Diameter to 12" 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.