Material
   Crystal Material
   Coating Material
Opticelement
   Spherical Lense
   Cylinder Lense
   Prism
   Windows
Coating
   MIR Coating
   FIR Coating
   UV Coating
   Visible Coating
   NIR Coating
   Optical Assembly
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   Windows
   Lenses
   Prism
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   Ad
   IR

Material


Sapphire
        Sapphire crystal is use for optical window lenses and Nitride Based Devices (Blue LEDs) . It has the following outing properties: outstanding physical-chemical properties, extraordinary mechanical resistance, high hardness, high optical resistance, resistance against high temperatures, high thermal conductivity, low electric conductivity, extremely low dielectric constant, strength even under extreme temperature conditions ,outstanding chemical resistance even against fluorination agents, perfect crystal lattice.

Detail


 

Crystal structure

 Hexagonal system

Lattice constants

a=4.785A , c=12.991A

Melting point

2300K

Density

3.98g/cm3

Mohs Hardness

9

thermal expansion

5.8 × 10 -6 /K

Reflection

0.418W.s/g/k

Thermal conductivity

25.12W/m/k (@ 100 ℃ )

Reflective index 

no =1.768 ne =1.760

Transmission band

T ≈ 82% (0.3 5 μ m)

Dielectric Constant

 11.5( ∥ c), 9.3( ⊥ c)

 

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