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Sapphire(Al2O3) window

Sapphire(Al2O3) window


Sapphire(Al2O3) optical window

Material

 Single crystal of Sapphire(Al2O3)
 Purity: >99.99%

Other Names

Sapphire window substrate, Al2O3 window, Sapphire glass window

Crystal structure

Hexagonal system

Applicable wave band

0.2um ~ 5.5um

Refractive Index
(at 300K)

∥C,1.762 @630nm ⊥C,1.770 @630nm

Melting Point

2040℃

Operating temperature

<1700℃
Thermal Conductivity

46.06 @ 0℃  25.12 @ 100℃,  12.56 @ 400℃ ( W/(m.K) )

Mohs hardness

9

Dielectric constant
(*103-109Hz @25℃)

∥C,11.5
⊥C,9.3

Thermal expansion coefficient

5.8x10-6/K

Maximum size

 Diameter 220mm (Single crystal)
 Square 300mm (Single crystal)

 

Material Standard Size Surface quality
Sapphire(Al2O3) window φ12.7mm x 3.0mm
φ25.4mm x 3.0mm
φ25mm x 1.0mm
φ50mm x 3.0mm
φ100mm x 0.5mm
φ100mm x 1.0mm
10 x 10 x 1.0mm
25.4 x 25.4 x 3.0mm
Polishing:             Double side optical polished or Epi-polished
Roughness:          Ra<0.5nm, Ra<1nm or Ra<5nm
Size Tolerance:          +/-0.1mm
Thickness Tolerance: +/-0.1mm or +/-0.05mm
Parallelism:           1 minute, 30 seconds, 5 seconds or higher
Surface Finish:      60-40, 40-20, 20-10 or others
Surface Figure:      1/2λ, 1/4λ or higher
Chamfer:                0.25mm × 45°

Sapphire (Al2O3) single crystal is an excellent optical window and substrate material. It has high temperature resistance, good thermal conductivity, high hardness, infrared transmission, and good chemical stability. Sapphire (Al2O3) window has high transmittance in the Ultraviolet, Visible and Infrared band, the transmission band range is 0.2-5.5um, its operating temperature can resistance at 1700 ℃, high hardness and second only to diamond, and resistance to acid and alkali corrosion.
 
Sapphire glass windows can be used as optical window lenses, lens protection external lenses, Isolation windows, armored windows, wear-resistant windows / optical components, high temperature and impact resistant optical windows, etc.
 

We can customize different size and thickness of Sapphire(Al2O3) optical window upon requirements, such as Sapphire(Al2O3) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.
 
 
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Contact Us

  • Biotain Crystal Co., Ltd.
  • Tel: (+86) 1506 0796 451
  • Fax: (+86) 592 523 6275
  • Email:
  • Work Time ( GMT +8 ):
  •    9 AM ~ 6 PM, from Monday to Friday
  • Main office: NO. 254, Hubin North Road, Xiamen City, Fujian Province, China