Abbe Number (v_d):

67.8

Bevel:

Protective as needed

Clear Aperture (%):

85

Clear Aperture CA (mm):

32.39

Diameter (mm):

38.10 +0.00/-0.13

Thickness (mm):

3.00 ±0.13

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)

Density (g/cm³):

2.20

Edges:

Fine Ground

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 Flatness (P-V):

1λ

Surface Quality:

40-20

Type:

Protective Window

Wavelength Range (nm):

200 - 3500

Young's Modulus (GPa):

73

Model Number:

QI-W-38-3

38.1mm Dia., 3mm Thick, Uncoated, ISP Optics IR Fused Silica Window | QI-W-38-3