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Sapphire
Optical window material for use in the UV, visible, and near infrared.

Sapphire is used for its extreme toughness and strength. Sapphire is a very useful optical window material for use in the UV, visible, and near infrared.

 

Transmission Range:  

0.17 to 5.5 μm

Refractive Index: 

No 1.75449; Ne 1.74663 at 1.06 μm

Reflection Loss:  

14% at 1.06 μm

Absorption Coefficient: 

0.3 x 10-3 cm-1 at 2.4 μm

Reststrahlen Peak

13.5 μm

dn/dT: 

13.1 x 10-6 at 0.546 μm

Density: 

3.97 g/cc

Melting Point: 

2040°C

Thermal Conductivity: 

27.21 W m-1 K-1 at 300K

Thermal Expansion: 

5.6 (para) & 5.0 (perp) x 10-6/K

 
 
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