Bevel:

Protective as needed

Clear Aperture (%):

85

Clear Aperture CA (mm):

21.59

Diameter (mm):

25.40 +0.00/-0.13

Thickness (mm):

4.00 ±0.13

Coating:

Uncoated

Coefficient of Thermal Expansion CTE (10^-6/°C):

6.1

Density (g/cm³):

5.33

Edges:

Fine Ground

Index of Refraction n_d:

4.002 @ 11µm

Knoop Hardness (kg/mm²):

780

Parallelism (arcmin):

<3

Poisson's Ratio:

0.28

Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More

Germanium (Ge)

Surface Flatness (P-V):

λ/10 @ 10.6μm

Surface Quality:

40-20

Type:

Protective Window

Wavelength Range (nm):

2000 - 14000

Young's Modulus (GPa):

102.7

Model Number:

GE-W-25-4

25.4mm Dia., 4mm Thick, Uncoated, ISP Optics Germanium (Ge) Window | GE-W-25-4