OST Photonics Al2O3 Crystals Sapphire

OST Photonics Al2O3 Crystals Sapphire

Al2O3 crystals Sapphire, featuring broad optical transmission from 150-5500nm spanning from UV to MWIR spectrum, and robust mechanical/thermal properties, are excellent for applications involving harsh and variant environments or requiring a broad transparent wavelength range e.g. windows of sensors and detectors, IR applications, etc.. The material's most distinguishing attribute is its unequaled mechanical strength, being the second hardest material after diamond, single sapphire crystals have a Knoop Hardness of 1800-2200, making the windows made from single crystals sapphire resistant in extreme to chemical corrosion and abrasions. Custom sapphire windows might be produced into thin optics without fracturing because of the tight internal covalent bonding of single-crystal sapphire while demonstrating good thermal stabilities due to its high thermal conduction.



Application of Al2O3 Crystals Sapphire



Infrared windows



LED lighting



Semiconductor device



Advantages of Al2O3 Crystals Sapphire



Features Extreme Surface Hardness Chemical Resistance



Transmits Wavelengths Ranging From UV to Mid-Infrared



Thinner and Stronger than Standard Glass Windows



Specifications of Al2O3 Crystals Sapphire



Orientation Random or as requested

Size Upon the customer’s request

Diameter Tolerance 0/-0.1 mm

Thickness Tolerance /-0.1 mm

Aperture 90%

Surface Quality 60/4010/5 S/D

Parallelism 1 arc minute

Chamfer 0.2-0.5mmx45°

Coating Uncoated or upon customer’s request



Properties of Al2O3 Crystals Sapphire



Transmission Range 0.17 to 5.5 microns

Refractive Index No 1.75449; Ne 1.74663 at 1.06 micron

Refractive Loss 14% at 1.06 micron

Absorption Coefficient 0.3 x 10^-3 cm-1 at 2.4 ?m

Reststrahlen Peak 13.5 ?m

dn/dT 13.1 x 10^-6 at 0.546 ?m

dn/d? 0 1.5 ?m

Crystal/Class Structure Trigonal hex, R3c

Molecular Weight 101.96

Cleavage Plane 1011, 1012, imperfect

Density 3.97 g/cc

Melting Point 2040°C

Hardness Knoop 2000 with 2000g indenter

Youngs Modulus 335 GPa

Shear Modulus 148.1 GPa

Bulk  Modulus 240 GPa

Poisson Ratio 0.25

Elastic Limit 300Mpa 45.000psi

Thermal Conductivity 27.21 W m-1 K-1 at 300K

Specific Heat Capacity 763 J Kg-1K-1 at 293K 4

Dielectric Constant 11.5 para 9.4 perp at 1MHz

Elastic Coefficients C11496 C12164 C13115 C33498 C44148

Solubility 98 x 10^-6 g/100g water.