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 (%):

90.00

Clear Aperture CA (mm):

18.00

Diameter (mm):

20.00 +0.00/-0.25

Thickness (mm):

2.00 ±0.1

Coating:

Uncoated

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

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):

λ/4

Surface Quality:

40-20

Type:

Protective Window

Wavelength Range (nm):

200 - 5500

Young's Modulus (GPa):

435

Type of Window:

Crystal

Regulatory Compliance

RoHS 2015:

Compliant

Reach 197:

Compliant

Certificate of Conformance:

View

Product Family Description

λ/4 Surface Flatness Ideal for Imaging Applications
Improved Surface Quality to Minimize Scatter in UV Applications
Excellent Transmission from 0.2 - 5.5μm
TECHSPEC® Sapphire Windows Also Available

Precision UV Grade Sapphire Windows feature UV grade sapphire substrates with improved surface quality specifications compared to our standard sapphire windows to minimize scatter in UV applications. These windows provide high transmission from 0.2 - 5.5μm and, due to sapphire’s structural strength, feature thinner thicknesses than standard glass windows, minimizing absorption. In addition to its broad transmission range, sapphire has extreme hardness second only to diamond, high thermal conductivity, and resistance to common chemical acids and alkalis. Precision UV Grade Sapphire Windows also feature λ/4 surface flatness, making them ideal for use in imaging and laser applications, especially those in harsh environments requiring tough, durable protective windows.

Title	Type	Stock Number	Price	Buy
8.0 - 118.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-666	₹9,095.00 Qty 10+ ₹8,186.00 Request Quote	10 to 12 days ×
7.0 - 67.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-669	₹8,755.00 Qty 10+ ₹7,880.00 Request Quote	10 to 12 days ×
7.0 - 40.0 Optic Height, English Bar-Type Optic Holder	Fixed	#03-676	₹8,075.00 Qty 10+ ₹7,268.00 Request Quote	10 to 12 days ×
5.0 - 25.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-529	₹7,905.00 Qty 10+ ₹7,115.00 Request Quote	10 to 12 days ×
10.0 - 60.0mm Optic Height, Metric Bar-Type Optic Holder	Fixed	#55-530	₹8,585.00 Qty 10+ ₹7,727.00 Request Quote	Contact Us ×
20.0mm Optic Dia., Optic Mount	Fixed	#64-559	₹2,635.00 Qty 10+ ₹2,372.00 Request Quote	10 to 12 days ×
4.0 - 36.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-077	₹11,985.00 Qty 5+ ₹10,549.00 Request Quote	10 to 12 days ×
5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp	Fixed	#16-078	₹31,195.00 Qty 5+ ₹27,515.00 Request Quote	10 to 12 days ×
2"/50.8mm Diameter, Bar Type Lens / Filter Holder, Quick Start Optical Mounts	Fixed	#17-530	₹12,215.00 Request Quote	10 to 12 days ×

20mm Dia. λ/4 Uncoated, Precision Sapphire Window

Regulatory Compliance

Product Family Description