Name: 76.2mm Dia. λ/20 Fused Silica Optical Flat
Brand: TECHSPEC
SKU: 47-573-000
Price: S$727.50

76.2mm Dia. λ/20 Fused Silica Optical Flat

Stock #47-573-000 3-5 days

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S$727.50

Qty 1-10
S$727.50

Qty 11+
S$654.75

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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):

76.20 +0.0/-0.51

Thickness (mm):

19.05 ±1.53

Diameter (inches):

3.00 +0.0/-0.02

Thickness (inches):

0.75 ±0.06

Clear Aperture CA (mm):

68.60

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 (Corning 7980)

Surface Quality:

60-40

Type:

Interferometry Window

Wavelength Range (nm):

200 - 2200

Young's Modulus (GPa):

Bevel:

Protective as needed

Regulatory Compliance

RoHS 2015:

Compliant

Reach 211:

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 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.