Sapphire single crystal
Sapphire is the second hardest crystal next to diamonds and because of their structural strength, sapphire windows can be made much thinner than other common dielectric windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al2O3) and is useful in a transmission range from 0.2 - 5.5μm.
|
Diameter |
0.2-300mm |
|
Thickness |
0.1-100mm |
|
Dimension tolerance |
+/-0.1mm or +/-0.02mm |
|
Surface quality (scratch & dig) |
60/40, 40/20 or better |
|
Clear aperture |
>85%, >90% |
|
Surface accuracy |
λ/10 λ/2 |
|
Parallelism |
+/-3' ,+/-30'' |
|
Bevel |
0.1~0.3mm x 45 degree |
|
Coating |
AR, BBAR or Custom |
