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RONAR-SMITH®
LASER OPTICS & IR IMAGING
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Infrared Optical Material -
Sapphire |
Infrared Optical Material -
Sapphire |CaF2|GaAs| Ge |
MgF2|ZnSe | ZnS |
Si | |
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| Sapphire initially refers to gem varieties of the mineral corundum, an aluminium oxide (Al2O3), when it is a color other than red. Nowadays, sapphire can be found naturally or manufactured in large crystal boules. Sapphire is highly transparent at wavelengths of 170 nm to 5.3 ¦Ìm (ultraviolet to infrared), as well as being five times stronger than glass. This leads to use of synthetic sapphire windows in high pressure chambers for spectroscopy. The hardest of the oxide crystals, sapphire retains its high strength at high temperatures and has good thermal properties. It is well known for chemically resistant to common acids and alkali at temperatures up to 1000 ¡ãC as well as to HF below 300 ¡ãC. |
| Maximum available size for windows, lenses and blanks: 100 mm Dia x 10 mm Thk and 100 mm Square x 10 mm Thk. |
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BASE
PROPERTIES
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PARAMETER
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VALUE
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OPTICAL
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Transmission
Range
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0.17
to 5.5 microns
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Refractive
Index
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1.75449
(o) 1.74663 (e) at 1.06 microns
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Reflection
Loss
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14%
at 1.06 microns (2 surfaces)
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Absorption
Coefficient
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0.3
x 10-3e cm-1 at 2.4¦Ìm
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Restrahlen
Peak
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13.5¦Ìm
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dN/dT
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13.7
x 10-6e at 5.4¦Ìm
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dN/d¦Ì
= 0
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1.5¦Ìm
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PHYSICAL
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Density
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3.97
g/cm3
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Melting
Point
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2040¡ãC
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Thermal
Conductivity
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27.21
W/(m*K) at 300K
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Thermal
Expansion
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5.6
(paral) & 5.0 (perp) x 10-6e/K *
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Hardness
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Knoop
2000 with 2000g indenter
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Specific
Heat Capacity
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419
J/(kg K)
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Dielectric
Constant
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11.5
(paral) 9.4 (perp) at 1MHz
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Young's
Modulus (E)
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335
GPa
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Shear
Modulus (G)
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148.1
GPa
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Bulk
Modulus (K)
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240
GPa
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Elastic
Coefficients
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C11=496
C12=164 C13=115 C33=498 C44=148
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Apparent
Elastic Limit
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275
MPa (40,000 psi)
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Poisson
Ratio
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0.25
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CHEMICAL
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Solubility
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98x10-6
g/100g water
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Molecular
Weight
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101.96
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Class/Structure
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Trigonal
(hex), R3c
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REFRACTIVE
INDEX
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Wavelength,
¦Ìm
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0.308
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0.325
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0.337
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0.351
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0.355
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0.442
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Refractive
Index (ne)
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1.811
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1.805
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1.801
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1.797
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1.796
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1.780
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Refractive
Index (no)
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1.802
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1.796
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1.792
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1.788
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1.787
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1.772
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Wavelength,
¦Ìm
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0.458
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0.488
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0.55
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0.532
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0.590
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0.633
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Refractive
Index (ne)
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1.778
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1.775
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1.773
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1.772
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1.768
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1.766
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Refractive
Index (no)
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1.770
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1.767
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1.765
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1.764
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1.760
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1.758
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Wavelength,
¦Ìm
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0.670
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0.694
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0.775
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0.780
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0.800
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0.820
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Refractive
Index (ne)
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1.764
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1.763
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1.761
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1.761
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1.760
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1.760
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Refractive
Index (no)
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1.756
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1.755
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1.753
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1.753
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1.752
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1.7528
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Wavelength,
¦Ìm
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0.980
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1.064
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1.320
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1.550
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2.010
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2.249
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Refractive
Index (ne)
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1.756
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1.754
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1.750
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1.746
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1.737
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1.732
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Refractive
Index (no)
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1.748
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1.747
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1.742
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1.738
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1.729
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1.724
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Wavelength,
¦Ìm
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2.703
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2.942
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3.333
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3.704
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4.000
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4.348
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Refractive
Index (ne)
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1.719
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1.712
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1.701
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1.687
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1.674
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1.658
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Refractive
Index (no)
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1.711
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1.704
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1.693
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1.699
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1.666
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1.65
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Wavelength,
¦Ìm
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4.762
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5.000
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5.263
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Refractive
Index (ne)
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1.636
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1.623
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1.607
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Refractive
Index (no)
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1.628
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1.615
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1.599
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