Bevel:

Protective as needed

Clear Aperture (%):

85

Clear Aperture CA (mm):

43.18

Diameter (mm):

50.80 +0.00/-0.13

Thickness (mm):

4.00 ±0.13

Coating:

BBAR (3000-5000nm)

Coating Specification:

Ravg <0.5% @ 3 - 5μm Rabs <1.5% @ 3 - 5μm

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

2.55

Density (g/cm³):

2.33

Edges:

Fine Ground

Index of Refraction n_d:

3.422 @ 5µm

Knoop Hardness (kg/mm²):

1150

Parallelism (arcmin):

<3

Poisson's Ratio:

0.265

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

Silicon (Si)

Surface Flatness (P-V):

2λ

Surface Quality:

40-20

Type:

Protective Window

Wavelength Range (nm):

3000 - 5000

Young's Modulus (GPa):

140

Model Number:

HDAR35-SI-W-50-4

50.8mm Dia., 4mm Thick, 3-5μm BBAR Coated, ISP Optics Silicon (Si) Window | HDAR35-SI-W-50-4