Sapphire window
Sapphire window retains its high strength at high temperatures, has good thermal properties and excellent transparency.It is chemically resistant to common acids and alkali at temperatures up to 1000 °C as well as to HF below 300 °C . These properties encourage its wide use in hostile environments where optical transmission in the range from the vacuum ultraviolet to the near infrared is required.
The wavelength of SYCCO general windows substrate(without coating)
| Attribute | General | High Precision |
| Dimension Tolerance: | +0.0/-0.2mm | +0.0/-0.02mm |
| Thickness Tolerance: | ±0.2mm | ,±0.005 |
| Surface Quality: | 60/40 | 10/5 |
| Clear Aperture: | ＞90% | ＞95% |
| Flatness: | λ/2 | λ/10 |
| Parallelism: | <3 arc min. | <3 arc sec. |
| AR Coated: | Uncoated, AR, HR, PR, etc. | Uncoated, AR, HR, PR, etc. |
| Dimensions | Depend on your request | |
|
|
B270 |
CaF2 |
Ge |
MgF2 |
N-BK7 |
Sapphire |
Si |
UV Fused Silica |
ZnSe |
ZnS |
|
Refractive index (nd) |
1.523 |
1.434 |
4.003 |
1.413 |
1.517 |
1.768 |
3.422 |
1.458 |
2.403 |
2.631 |
|
Coefficient of dispersion (Vd) |
58.5 |
95.1 |
N/A |
106.2 |
64.2 |
72.2 |
N/A |
67.7 |
N/A |
N/A |
|
Density(g/cm3) |
2.55 |
3.18 |
5.33 |
3.18 |
2.46 |
3.97 |
2.33 |
2.20 |
5.27 |
5.27 |
|
TCE(μm/m℃) |
8.2 |
18.85 |
6.1 |
13.7 |
7.1 |
5.3 |
2.55 |
0.55 |
7.1 |
7.6 |
|
Soften Temperature(℃) |
533 |
800 |
936 |
1255 |
557 |
2000 |
1500 |
1000 |
250 |
1525 |
|
Knoop hardness (kg/mm2) |
542 |
158.3 |
780 |
415 |
610 |
2200 |
1150 |
500 |
120 |
120 |
a: Dimesion size : 0.2-500mm , thickness >0.1mm
b: Many material could be choiced , include IR material like Ge, Si, Znse, fluoride and so on
c: AR coating or as your request
d: Product shape : round , rectangle or custom shape
