UQG Optics

SAPPHIRE
OPTICAL PROPERTIES
Transmission Range 0.17 to 5.5 microns
Refractive Index (table below) 1.75449 (o) 1.74663 (e) at 1.06 microns
Reflection Loss 14% at 1.06 microns (2 surfaces)
Absorption Coefficient 0.3 x 10-3 cm-1 at 2.4µm
Reststrahlen Peak 13.5µm
dN/dT 13.7 x 10-6 at 5.4µm
dN/dµ = 0 1.5µm

PHYSICAL PROPERTIES
Density 3.97 gm/cc
Melting Point 2040°C
Thermal Conductivity 27.21 Wm-1K-1 at 300K
Thermal Expansion 5.6 (para) & 5.0 (perp) x 10-6/K *
Hardness Knoop 2000 with 2000g indenter
Specific Heat Capacity 419 J Kgm-1K-1
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

CHEMICAL PROPERTIES
Solubility 98 x 10-6 g/100g water
Molecular Weight 101.96
Class/Structure Trigonal (hex), R3c


µm No Ne µm No Ne µm No Ne
0.193 1.92879 1.91743 0.442 1.78038 1.77206 1.064 1.75449 1.74663
0.213 1.88903 1.87839 0.458 1.77843 1.77015 1.320 1.75009 1.74227
0.222 1.8754 1.86504 0.488 1.7753 1.76711 2.703 1.719 1.711
0.226 1.87017 1.85991 0.515 1.77304 1.76486 2.941 1.712 1.704
0.244 1.85059 1.84075 0.532 1.7717 1.76355 3.333 1.701 1.693
0.248 1.84696 1.83719 0.694 1.76341 1.75542 3.704 1.687 1.679
0.257 1.83932 1.82972 0.755 1.76141 1.75346 4.000 1.674 1.666
0.266 1.83304 1.82358 0.780 1.76068 1.75274 4.348 1.658 1.65
0.337 1.80082 1.79206 0.800 1.76013 1.7522 4.762 1.636 1.628
0.351 1.79693 1.78825 0.820 1.75961 1.75168 5.000 1.623 1.615
0.355 1.79598 1.78732 0.980 1.75607 1.74819      


WHILE EVERY ATTEMPT HAS BEEN MADE TO VERIFY THE SOURCE OF THE INFORMATION, NO RESPONSIBILITY IS ACCEPTED FOR ACCURACY OF DATA.