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Jiaxing AOSITE Photonics Technology Co.,Ltd.
custom sapphire windows
custom sapphire windows

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. 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

60/40~10/5 (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 μm

Reststrahlen Peak

13.5 μm

dn/dT

13.1 x 10^-6 at 0.546 μm

dn/dμ = 0

1.5 μm

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

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

Solubility

98 x 10^-6 g/100g water


Technical Images of Al2O3 Crystals (Sapphire)

QQ图片20170625180738.png


Contact Us
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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
sales@ostphotonics.com; info@ostphotonics.com +86-0571-86780460