Introduction: Sapphire is a superior window material with excellent transparency and thermal properties. It has high transmittance from 1.5um to 6um in the middle infrared. 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.
Main Application：Substrate material, IR optics windows, Aerospace, analytical applications, medical applications etc..
Main Properties：
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Crystal Type
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Hexagonal
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Lattice Parameter
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a=4.75Å, c=12.97Å
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Transmission Band
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0.15-6 um
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Mohs Hardness
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9
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Density
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3.98g/cm3
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Melting Point
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2040 ℃
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Refractive Index
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1.623 at 5um
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Specific Heat
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0.18cal/g/℃
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Thermal Expansion
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7.7x10-6/℃
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Thermal Conductivity
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4W/cm/℃
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CASTECH supply Sapphire widows and mirrors with：
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Orientation
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Random or C-cut within ±30 arc min
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Wave Front Distortion
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< 1/4 wave
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Diameter
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+0/-0.10mm
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Length
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+/-0.2mm
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Chamfer
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0.20+/-0.10mm @ 45°
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Flatness
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< 1/4 wave at 633nm
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Parallelism
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< 30 arc Seconds
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Perpendicularity
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< 5 arc min
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Surface Quality
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40/20 Scratch/Dig
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CASTECH supply Sapphire lenses with：
|
Orientation
|
Random or C-cut within ±30 arc min
|
|
Wave Front Distortion
|
< 1/4 wave
|
|
Diameter
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+0/-0.10mm
|
|
Length
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+/-0.2mm
|
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Paraxial Focal Length
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+/-2%
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Centration
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3 arc minutes
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Chamfer
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0.20+/-0.10mm @ 45°
|
|
Flatness
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< 1/4 wave at 633nm
|
|
Surface Quality
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60/40 Scratch/Dig
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