Name: 25mm Dia., 2.3mm Thick, VIS-NIR AR Coated Sapphire Window
Brand: TECHSPEC
SKU: 36-582
Price: $117.50

Abbe Number (v_d):

72.24

Axis Orientation:

Random

Bevel:

Protective as needed

Birefringence (n_o-n_e):

0.008 for Visible Light Orthogonal to Optical Axis

Clear Aperture (%):

≥90

Clear Aperture CA (mm):

22.50

Diameter (mm):

25.00 ±0.25

Thickness (mm):

2.30 ±0.10

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):

8.8

Density (g/cm³):

3.97

Edges:

Fine Ground

Index of Refraction n_d:

1.77

Knoop Hardness (kg/mm²):

1900

Parallelism (arcmin):

≤3.5

Poisson's Ratio:

0.27

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

Sapphire (Al₂O₃)

Surface Flatness (P-V):

2λ (typical)

Surface Quality:

80-50

Type:

Protective Window

Wavelength Range (nm):

400 - 1000

Young's Modulus (GPa):

435

Type of Window:

Crystal

Regulatory Compliance

RoHS 2015:

Compliant

Reach 224:

Compliant

Certificate of Conformance:

View

Product Family Description

Features Extreme Surface Hardness Chemical Resistance
Transmits Wavelengths Ranging From UV to Mid-Infrared
Thinner and Stronger than Standard Glass Windows
Anti-Reflection Coating Options Covering 400 - 5000nm Available

TECHSPEC® Sapphire Windows are manufactured from single crystal sapphire, making them ideal for demanding applications (such as laser systems) because of their extreme surface hardness, high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Sapphire is the second hardest crystal next to diamond and, because of their structural strength, sapphire windows can be made much thinner than other common windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al₂O₃) and is useful in a transmission range from 330 - 5500nm when uncoated. TECHSPEC® Sapphire Windows are available with anti-reflection (AR) coatings to improve performance in the visible, NIR, and IR spectra with coating options covering 400 - 5000nm.

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