Sapphire Crystal(AI2O3)

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Large size Sapphire crystals up to 4'' boule are available from Red Optronics.  As the hardest of all oxide crystals, Sapphire has a combination of optical and physical properties that make it the best choice for a variety of demanding applications.  Sapphire maintains its strength even at high temperatures.  It has good thermal properties, excellent electrical and dielectric properties and is resistant to chemical attack.  These properties encourage the use of Sapphire in aggressive environments where reliability, optical transmission and strength are required.


  • 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

Physical and Optical Properties  
Crystal structure Hexagonal System
Lattice a=4.785, C=12.991
Density 3.98g/cm3
Transmission Range 150-5500nm
Melting Point 2040C
Specific Heat 0.418 W.s/g/K
Thermal Conductivity 25.12 W/m/K
Thermal Shock Resistance 790 W/m
Thermal Expansion Coefficient 5.8x10-6/K
dn/dt, @633nm 13x10-6/K
Hardness 9 Mohs 
Refractive Index 1.83 @0.26mm, 1.76 @0.63mm, 1.58 @5.57mm

Other high-precision Sapphire windows, AR- and HR-coatings are available upon request. Sapphire boule grown by CZ method and as-cut Sapphire blocks are also available.




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