Sapphire Al2O3
Crystaltechno Ltd. manufactures the following Sapphire optics: blanks,
windows, protective windows, spherical plano-convex lenses. Sapphire
Al2O3 optics - transparent in wide spectral range from 0.17 to 5.5
microns.
Single crystal sapphire Al2O3 possesses a unique combination of
excellent optical, physical and chemical properties. The hardest of the
oxide crystals, sapphire Al2O3 retains its high strength at high
temperatures, has good thermal properties and excellent transparency.
Sapphire Al2O3 optics is chemically resistant to common acids and alkali
at temperatures up to 1000 &grad;C as well as to HF below 300
&grad;C. These properties encourage its wide use of Sapphire Al2O3
optics in hostile environments where optical transmission in the range
from the visible to the near infrared is required.
The following products from Sapphire are available: BLANKS, WINDOWS, LENSES.
SAPPHIRE Al2O3 BASE PROPERTIES
|
PARAMETER |
|
VALUE |
|
|
|
|
|
|
| OPTICAL PROPERTIES of SAPPHIRE Al2O3 |
|
| |
Transmission Range |
|
0.17 to 5.5 microns |
|
| |
Refractive Index |
|
1.75449 (o) 1.74663 (e) at 1.06 microns |
|
| |
Reflection Loss |
|
at 1.06 µm (2 surfaces) for o-ray – 11.7%; for e-ray – 14.2% |
|
| |
Index of Absorption |
|
0.3 x 10-3 cm-1 at 2.4µm |
|
| |
dN/dT |
|
13.7 x 10-6 at 5.4µm |
|
| |
dn/dm = 0 |
|
1.5µm |
|
| |
|
|
|
|
| PHYSICAL PROPERTIES of SAPPHIRE Al2O3 |
|
| |
Density |
|
3.97 g/cm3 |
|
| |
Melting Point |
|
2040 °C |
|
| |
Thermal Conductivity |
|
27.21 W/(m? K) at 300KK |
|
| |
Thermal Expansion |
|
5.6 (paral) & 5.0 (perp) x 10-6/K |
|
| |
Hardness |
|
Knoop 2000 with 2000g indenter |
|
| |
Specific Heat Capacity |
|
419 J/(kg? K) |
|
| |
Dielectric Constant |
|
11.5 (paral) 9.4 (perp) at 1MHz |
|
| |
Young's Modulus (E) |
|
335 GPa |
|
| |
Shear Modulus (G) |
|
148.1 GPa |
|
| |
Bulk Modulus (K) |
|
240 GPa |
|
| |
Elastic Coefficients |
|
C11=496
C12=164 C13=115
C33=498 C44=148 |
|
| |
Apparent Elastic Limit |
|
275 MPa (40,000 psi) |
|
| |
Poisson Ratio |
|
0.25 |
|
| CHEMICAL PROPERTIES of SAPPHIRE Al2O3 |
|
| |
Solubility |
|
98? 10-6
g/100g water |
|
| |
Molecular Weight |
|
101.96 |
|
| |
Class/Structure |
|
Trigonal (hex), R3c |
|
SAPPHIRE Al2O3 REFRACTIVE INDEX
|
Wavelength, µm |
|
Refractive
Index no |
|
Refractive
Index ne |
|
|
|
|
|
|
|
|
|
|
| |
0.193 |
|
1.92879 |
|
1.91743 |
|
| |
0.213 |
|
1.88903 |
|
1.87839 |
|
| |
0.222 |
|
1.87540 |
|
1.86504 |
|
| |
0.226 |
|
1.87017 |
|
1.85991 |
|
| |
0.244 |
|
1.85059 |
|
1.84075 |
|
| |
0.248 |
|
1.84696 |
|
1.83719 |
|
| |
0.257 |
|
1.83932 |
|
1.82972 |
|
| |
0.266 |
|
1.83304 |
|
1.82358 |
|
| |
0.280 |
|
1.82437 |
|
1.81509 |
|
| |
0.308 |
|
1.81096 |
|
1.80198 |
|
| |
0.325 |
|
1.80467 |
|
1.79582 |
|
| |
0.337 |
|
1.80082 |
|
1.79206 |
|
| |
0.351 |
|
1.79693 |
|
1.78825 |
|
| |
0.355 |
|
1.79598 |
|
1.78732 |
|
| |
0.442 |
|
1.78038 |
|
1.77206 |
|
| |
0.458 |
|
1.77843 |
|
1.77015 |
|
| |
0.488 |
|
1.77530 |
|
1.76711 |
|
| |
0.515 |
|
1.77304 |
|
1.76486 |
|
| |
0.532 |
|
1.77170 |
|
1.76355 |
|
| |
0.590 |
|
1.76804 |
|
1.75996 |
|
| |
0.633 |
|
1.76590 |
|
1.75787 |
|
| |
0.670 |
|
1.76433 |
|
1.75632 |
|
| |
0.694 |
|
1.76341 |
|
1.75542 |
|
| |
0.755 |
|
1.76141 |
|
1.75346 |
|
| |
0.780 |
|
1.76068 |
|
1.75274 |
|
| |
0.800 |
|
1.76013 |
|
1.7522 |
|
| |
0.820 |
|
1.75961 |
|
1.75168 |
|
| |
0.980 |
|
1.75607 |
|
1.74819 |
|
| |
1.064 |
|
1.75449 |
|
1.74663 |
|
| |
1.320 |
|
1.75009 |
|
1.74227 |
|
| |
1.550 |
|
1.74618 |
|
1.73838 |
|
Delivery
Maximum available size of round Sapphire Al2O3 optics (windows, lenses and blanks) 100 mm Dia x 10 mm Thk.
Maximum available size of square Sapphire Al2O3 optics (100x100) mm, x 10 mm Thk.
Sapphire Al2O3 optics is also available in the following forms, namely
- Sapphire Al2O3 round rod (2-20 mm Dia, 150-300 mm long),
- rectangular and square Sapphire Al2O3 rod
- Sapphire Al2O3 ribbon (10-80 mm wide, 1-4 mm thick, 150-300 mm long)
- Sapphire Al2O3 tubes (3-30 mm Dia, 1-8 mm wall thickness, 150-300 mm
long) and other custom cross-section configurations of Sapphire Al2O3
optics.
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