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Sapphire

 

Description:  

Sapphire is a superior window material with excellent transparency and thermal properties. It also exhibits excellent physical and chemical properties. It is chemically inert and insoluble in almost everything and it can be scratched only by few substances (such as diamond or boron nitride) other than itself.

 

Features:

  • High transmittance from 1.5um to 6um in the middle infrared;

  • Good thermal properties, excellent electrical and dielectric properties.

 

Applications:

  • UV and IR Optics;

  • Windows for High Temperature and Pressure, Corrosion Resistance, Abrasion Resistance;

  • Heat Sinders and Thermocouplers; Semiconductor Wafer Carriers;

  • Electrical Insulators;

  • Thin Film Deposition;

  • Transparent Electronic Substrate;

  • Silicon on Sapphire Wafers; Superconductor Substrate;

  • Substrate material, IR optics windows, Aerospace, analytical and medical applications.

 

Physical and Optical Properties:

Crystal StructureHexagonal System                            
Latticea=4.785, C=12.991
Density3.98g/cm3
Transmission Range 150-5500nm
Melting Point2040 ℃
Specific Heat0.418 W.s/g/K
Thermal Conductivity25.12 W/m/K
Thermal Shock Resistance790 W/m
Thermal Expansion Coefficient5.8x10-6/K
dn/dt13x10-6/K@633nm
Hardness9 Mohs 
Refractive Index1.83 @0.26mm, 1.76 @0.63mm, 1.58 @5.57mm

 Note: Other high-precision Sapphire windows, AR- and HR-coatings are available upon request.