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Sapphire physical property

Sapphire glass is manufactured from single crystal sapphire(Al2O3 ), making them ideal for demanding applications (such as laser systems) because of their extreme surface hardness, high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Sapphire is the second hardest crystal next to diamonds and, because of their structural strength, sapphire windows can be made much thinner than other common dielectric windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al2O3), and is useful in a transmission range from 0.2 - 5.5µm.

Why choose sapphire glass ?
1- Thinner and Stronger than Standard Glass Windows
 

2- Transmits Wavelengths Ranging From UV to Mid-Infrared
 

3- Features Extreme Surface Hardness and Chemical Resistance
 

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2. Comparison of optical window materials
Material                                                 Properties                                      Applications
  BK7
Transmission Range: 330-2100nm
Refractive Index: 1.5164@588nm  Most popular and low cost  Visible and near IR spectrum applications
Fused Silica
Transmission Range: 185-2500nm          Low Thermal Expansion      UV to IR spectrum
Refractive Index: 1.4858@308nm      Coefficient: 0.54 x 10-6K       Best choice for thermal  resistance  

                                       
Sapphire
Transmission Range: 180-4500nm       Strong Hardness   Best choice for scratch resistance applications 
Refractive Index: 1.755@1000nm                                        Thinner optics Wide Transmission Range

Calcium Fluoride
Transmission Range: 170-7800nm        Little Hygroscopic Susceptibility     IR laser applications
Coefficient: 18.85 x 10-6K                           High Thermal Expansion

Refractive Index: 1.399@5000nm
  
MgF2
Transmission Range: 120-7000nm                                                              UV laser applications

3. commen size for sapphire optical parts
Diameter 0.2-300mm or customization
Diameter tolerance +/-0.1mm or +/-0.02mm
Thickness 0.10-100mm
Thickness tolerance ± 0.1mm or +/-0.02mm
Surface quality (scratch & dig) 60/40, 40/20 or better
Surface accuracy λ/10, λ/2, λ
Clear Aperture >85%, >90%
Parallelism +/-3' ,+/-30''
Bevel 0.1~0.3mm×45 degree

4.0 sample small tube in details 

5. We can supply professional customized service in time and provide cooperation

and support of new product development and technology appliance.