Сапфир Al2O3

Optics-M produces lenses, domes, windows, prisms, wedges, ball lenses, cylindrical lenses and others optical components according to customers’ specifications and drawings out of sapphire Al2O3.

Sapphire is used for its extreme toughness and strength. Sapphire is a very useful optical window material for use in the UV, visible, and near infra-red.

Sapphire is grown by a variety of methods. Verneuil and Czochralski methods are usual for standard grade Sapphire material. Higher quality Sapphire, particularly for electronic substrates is manufactured by Kyropulos growth and this can be very pure with excellent UV transmission. Large thin sheets of Sapphire can be made by ribbon growth. Sapphire is slightly birefringent, general purpose IR windows are usually cut in a random way from crystal but for specific applications where the birefringence is an issue, an orientation is selected. Usually this is with the optic axis at 90 degrees to the surface plane and is known as "zero degree" material. Synthetic optical sapphire has no colouration.

Product Data

Transmission Range 0.17 to 5.5 μm
Refractive Index No 1.75449; Ne 1.74663 at 1.06 μm (1)
Reflection Loss 14% at 1.06 μm
Absorption Coefficient 0.3 x 10-3 cm-1 at 2.4 μm (2)
Reststrahlen Peak 13.5 μm
dn/dT 13.1 x 10-6 at 0.546 μm (3)
dn/dμ 0 : 1.5 μm
Density 3.97 g/cc
Melting Point 2040°C
Thermal Conductivity 27.21 W m-1 K-1 at 300K
Thermal Expansion 5.6 (para) & 5.0 (perp) x 10-6/K *
Hardness Knoop 2000 with 2000g indenter
Specific Heat Capacity 763 J Kg-1 K-1 at 293K (4)
Dielectric Constant 11.5 (para) 9.4 (perp) at 1MHz
Youngs 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 300 MPa (45,000 psi)
Poisson Ratio 0.25
Solubility 98 x 10-6 g/100g water
Molecular Weight 101.96
Class/Structure Trigonal (hex), R3c

Transmittance

Refractive Index

No = Ordinary Ray

Ne = Extraordinary Ray

µm No Ne µm No Ne µm No Ne
0.193 1.9288 1.9174 0.213 1.8890 1.8784 0.222 1.8754 1.8650
0.226 1.8702 1.8599 0.244 1.8506 1.8407 0.248 1.8470 1.8372
0.257 1.8393 1.8297 0.266 1.8330 1.8236 0.280 1.8244 1.8151
0.308 1.8110 1.8020 0.325 1.8047 1.7958 0.337 1.8001 1.7921
0.351 1.7969 1.7882 0.355 1.7960 1.7883 0.442 1.7804 1.7721
0.458 1.7784 1.7702 0.488 1.7753 1.7671 0.515 1.7730 1.7649
0.532 1.7717 1.7636 0.590 1.7680 1.7600 0.633 1.7659 1.7579
0.670 1.7643 1.7563 0.694 1.7634 1.7554 0.755 1.7614 1.7535
0.780 1.7607 1.7527 0.800 1.7601 1.7522 0.820 1.7596 1.7517
0.980 1.7561 1.7482 1.064 1.7545 1.7466 1.320 1.7501 1.7423
1.550 1.7462 1.7384 2.010 1.7375 1.7297 2.249 1.7323 1.7243
2.703 1.719 1.711 2.941 1.712 1.711 3.333 1.701 1.693
3.704 1.687 1.679 4.000 1.674 1.666 4.348 1.658 1.65
4.762 1.636 1.628 5.000 1.623 1.615 5.263 1.607 1.599