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Basic Properties of Sapphire Crystals

Transparency Range: 180 - 4500 nm

material-sa.GIF (11133 bytes)

Transmission Curve

Crystal Symmetry: Hexagonal
Density:  3.98 g/cm3
Lattice Constants: a=b=4.758A, c=12.991A
Thermo-Optic Coefficients:
dn/dT= 1.2 x 10
-6 /oC
Optical Homogeneity: Δn < 10-6/cm
Mohs Hardness:  9.0
Thermal Conductivity: 52 W/m/K
Thermal Expansion Coefficients: α = 8.4 x 10-6/K

Sellmeier Equations: (λ in µm) :
no2=1+ 1.43135 λ2/( λ2 - 0.00528  ) + 0.65055 λ2/(λ2- 0.01424)+ 5.34140 λ2 /( λ2-325.01800 )  
n
e2=1+
1.50398 λ2/( λ2 -  0.00548 ) + 0.55069λ2/( λ2-0.01480 )+ 6.59274λ2/( λ2-402.89500 )

Wavelength(nm) no ne Birefringence
(Δn=ne -no)
Walk-off Angle
 at 45°
1064 1.7545 1.7467 -0.0275 0.257°
800 1.7602 1.7522 -0.0278 0.258°
632.8 1.7659 1.7579 -0.0283 0.261°
532 1.7717 1.7636 -0.0288 0.263°
355 1.7960 1.7873 -0.0310 0.276°
266 1.8331 1.8236 -0.0346 0.296°


Crystallographic orientations:
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