Name: 254mm Dia. λ/20 Fused Silica Optical Flat
Brand: TECHSPEC
SKU: 65-879-000
Price: A$13,532.80

254mm Dia. λ/20 Fused Silica Optical Flat

Stock #65-879-000 3-5 days

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A$13,532.80

Qty 1-2
A$13,532.80

Qty 3+
A$12,856.00

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Surface Flatness (P-V):

λ/20

Abbe Number (v_d):

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):

254.00 +0.00/-1.00

Thickness (mm):

38.10 ±2.5

Diameter (inches):

10.00 +0.00/-0.04

Thickness (inches):

1.50 ±0.10

Clear Aperture CA (mm):

228.60

Color:

Clear

Construction:

Single Surface

Density (g/cm³):

2.20

Index of Refraction n_d:

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):

Bevel:

Protective as needed

Regulatory Compliance

Reach 191:

Compliant

RoHS 2015:

Compliant

Certificate of Conformance:

View

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.