Abbe Number (v_d):

58.3

Bevel:

Protective as needed

Clear Aperture CA (mm):

11.25

Diameter (mm):

12.50 ±0.25

Thickness (mm):

2.00

Coating:

VIS-NIR (400-1000nm)

Coating Specification:

R_avg ≤0.25% @ 880nm
R_avg ≤1.25% @ 400 - 870nm
R_avg ≤1.25% @ 890 - 1000nm

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

9.4 (+20 to +300°C)

Density (g/cm³):

2.56

Edges:

Fine Ground

Index of Refraction n_d:

1.523

Knoop Hardness (kg/mm²):

500

Poisson's Ratio:

0.22

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

B270

Surface Flatness (P-V):

1λ

Surface Quality:

60-40

Type:

Protective Window

Wavelength Range (nm):

360 - 2700

Young's Modulus (GPa):

71.5

5 J/cm² @ 532nm, 10ns

12.5mm Diameter, VIS-NIR Coated, B270 Window

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