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OST Photonics Al2O3 Crystals (Sapphire)

OST PhotonicsAl2O3 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 windowsmight 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 ofAl2O3 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

60/40~10/5 (S/D)

Parallelism

<1 arc minute

Chamfer

Coating

Uncoated or upon customer’s request

Properties of Al2O3 Crystals (Sapphire)

Transmission Range

Refractive Index

No 1.75449; Ne 1.74663 at 1.06 micron

Refractive Loss

14% at 1.06 micron

Absorption Coefficient

Reststrahlen Peak

dn/dT

dn/dμ = 0

Crystal/Class Structure

Trigonal (hex), R3c

Molecular Weight

Cleavage Plane

(1011), (1012), imperfect

Density

Melting Point

2040°C

Hardness (Knoop)

2000 with 2000g indenter

Youngs Modulus

335 GPa

Shear Modulus

Bulk Modulus

240 GPa

Poisson Ratio

Elastic Limit

300Mpa (45.000psi)

Thermal Conductivity

Specific Heat Capacity

763 J Kg-1K-1at 293K (4)

Dielectric Constant

Elastic Coefficients

C11=496 C12=164 C13=115 C33=498 C44=148

Solubility

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



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