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 Products>Waveplates Crystals>>Sapphire
Crystal |
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| Sapphire Crystal |
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| Single crystal sapphire possesses a unique combination of excellent optical, physical and chemical properties. The hardest of the oxide crystals, sapphire 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 visible to the near infrared is required. Maximum available size for windows, lenses and blanks: 100 mm Dia x 10 mm Thk and 100 mm Square x 10 mm Thk. Sapphire is also available in form of round rod (2-20 mm Dia, 150-300 mm long), rectangular and square rod and ribbon (10-80 mm wide, 1-4 mm thick, 150-300 mm long), tubing (3-30 mm Dia, 1-8 mm wall thickness, 150-300 mm long) and other custom cross-section configurations. |
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Sapphire
|
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| BASE PROPERTIES | |
|
PARAMETER |
VALUE |
| OPTICAL |
|
|
Transmission Range |
0.17 to 5.5
microns |
|
Refractive
Index |
1.75449
(o) 1.74663 (e) at 1.06 microns |
|
Reflection
Loss |
14% at 1.06 microns (2 surfaces) |
|
Absorption
Coefficient |
0.3
x 10-3e cm-1 at 2.4μm |
|
Restrahlen
Peak |
13.5μm |
|
dN/dT |
13.7
x 10-6e at 5.4μm |
|
dN/dμ = 0 |
1.5μm |
PHYSICAL |
|
|
Density |
3.97 g/cm3 |
|
Melting
Point |
2040°C |
|
Thermal Conductivity |
27.21 W/(m*K) at 300K |
|
Thermal
Expansion |
5.6
(paral) & 5.0 (perp) x 10-6e/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 |
|
|
Solubility |
98x10-6 g/100g water |
|
Molecular
Weight |
101.96 |
|
Class/Structure |
Trigonal (hex),
R3c |
| REFRACTIVE INDEX | ||||||
|
Wavelength,
μm |
0.308 |
0.325 |
0.337 |
0.351 |
0.355 |
0.442 |
|
Refractive
Index (ne) |
1.811 |
1.805 |
1.801 |
1.797 |
1.796 |
1.780 |
|
Refractive
Index (no) |
1.802 |
1.796 |
1.792 |
1.788 |
1.787 |
1.772 |
| |
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|
|
|
|
|
|
Wavelength,
μm |
0.458 |
0.488 |
0.55 |
0.532 |
0.590 |
0.633 |
|
Refractive
Index (ne) |
1.778 |
1.775 |
1.773 |
1.772 |
1.768 |
1.766 |
|
Refractive
Index (no) |
1.770 |
1.767 |
1.765 |
1.764 |
1.760 |
1.758 |
| |
|
|
|
|
|
|
|
Wavelength,
μm |
0.670 |
0.694 |
0.775 |
0.780 |
0.800 |
0.820 |
|
Refractive
Index (ne) |
1.764 |
1.763 |
1.761 |
1.761 |
1.760 |
1.760 |
|
Refractive
Index (no) |
1.756 |
1.755 |
1.753 |
1.753 |
1.752 |
1.7528 |
| |
|
|
|
|
|
|
|
Wavelength,
μm |
0.980 |
1.064 |
1.320 |
1.550 |
2.010 |
2.249 |
|
Refractive
Index (ne) |
1.756 |
1.754 |
1.750 |
1.746 |
1.737 |
1.732 |
|
Refractive
Index (no) |
1.748 |
1.747 |
1.742 |
1.738 |
1.729 |
1.724 |
| |
|
|
|
|
|
|
|
Wavelength,
μm |
2.703 |
2.942 |
3.333 |
3.704 |
4.000 |
4.348 |
|
Refractive
Index (ne) |
1.719 |
1.712 |
1.701 |
1.687 |
1.674 |
1.658 |
|
Refractive
Index (no) |
1.711 |
1.704 |
1.693 |
1.699 |
1.666 |
1.65 |
|
Wavelength,
μm |
4.762 |
5.000 |
5.263 |
|||
|
Refractive
Index (ne) |
1.636 |
1.623 |
1.607 |
|||
|
Refractive
Index (no) |
1.628 |
1.615 |
1.599 |
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