4" Dia. λ/10 Fused Silica Dual Surface Flat

Surface Flatness (P-V):

λ/10

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):

101.60 ±1.0

Thickness (mm):

19.05 ±1.5

Diameter (inches):

4.00 ±0.04

Thickness (inches):

0.75 ±0.06

Clear Aperture CA (mm):

91.40

Construction:

Dual Surface

Density (g/cm³):

2.20

Index of Refraction n_d:

1.458

Knoop Hardness (kg/mm²):

522

Parallelism (arcmin):

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

RoHS 2015:

Compliant

Reach 211:

Compliant

Certificate of Conformance:

View

Product Family Description

λ/10 and λ/20 Surface Flatness Options
Each λ/20 Flat 76.2mm and Larger Includes a Certificate of Calibration
Extended Lifetime in Contact Measurement Applications
Single Surface Optical Flats Also Available

Our Precision Dual Surface Optical Flats are precision ground and polished to the stated accuracies on both surfaces so that either face may be used for test applications. Both surfaces are tested and certified by our Zygo Interferometer. Each flat ships in a durable storage case for permanent protection. λ/20 flats that are 76.2mm or larger also include a certificate of calibration.

Title	Type	Stock Number	Price	Buy
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	$107.00 Qty 10+ $96.30 Request Quote	In Stock ×
19.5 - 108.0mm Optic Dia., Three-Screw Adjustable Ring Mount	Fixed	#03-670	$101.00 Qty 10+ $89.20 Request Quote	In Stock ×
108.0mm Max Optic Dia., Jaw Clamp	Fixed	#53-038	$624.00 Qty 5+ $549.50 Request Quote	In Stock ×
108.0mm Max Optic Dia., Jaw Clamp and 6" Kinematic Mount	Adjustable - Tip-Tilt	#53-040	$933.00 Qty 5+ $868.40 Request Quote	In Stock ×
100.0/101.6mm Optic Dia., E-Series Kinematic Mount	Adjustable - Tip-Tilt	#15-869	$262.00 Qty 10+ $248.40 Request Quote	In Stock ×