Sapphire

Sapphire possesses nice light transmission in 0.20 ~ 5.50μm wave band, is ideal for laser and infrared optical materials.Products widely used in endoscope, watch glass, optical lens, surface acoustic wave filter, military infrared window, optical filter, observation window for high/low temperature and cosmetic instrument windows, etc.

Classification:

Precision optics

Detailed introduction

Sapphire possesses nice light transmission in 0.20 ~ 5.50μm wave band, is ideal for laser and infrared optical materials. Products widely used in endoscope, watch glass, optical lens, surface acoustic wave filter, military infrared window, optical filter, observation window for high/low temperature and cosmetic instrument windows, etc. We can provide anti-reflection film, high-reflective film, dielectric film, filter film and metalized film services.

Sapphire windows are also applied as circuit substrates and epitaxial substrates to GaN, GaAs.

Sapphire windows mainly contain four types: circular windows, oval windows, oblique circular windows and step windows

ADVANTAGES：

High Sensitivity

Optimized Scratch Resistance

High Anti-Abrasion Excellent Light Transmission

Good Chemical Stability, High Anti- Corrosion Characteristics

Transmits Wavelengths Ranging from UV to Mid-Infrared

Processing Standards

Sapphire Lenses	Commercial Grade	Factory Standard	Precision Grade
Diameter Tolerance(mm)	+0/-0.30	+0/-0.25	+0/-0.10
Center Thickness(mm)	±0.10	±0.05	±0.03
Radius (%)	±2%	±1.5%	±1%
Focal Length Tolerance (%)	<5%	<5%	<3%
Figure Tolerance in λ(Pow/irreg)	5 - 2	2 - 1	1 - 1/2
Centration (Arc min)	5'	5'	3'
Dia. To Thick Ratio	9~50:1
Coating (T% avg)	96% @ 3-5um/7-14um. 95% @ 4-12um
Orientation	C，A，R，M

Main Types

Transmittance curve

Material Features

Properties	Sapphire
Chemical Formula	AL₂O₃
CrystalStructure	Hexagonal System a=4.76Å c=12.99 Å
Melting Temperature	2053℃
Density	3.98g/cm³
Hardness	9(mohs)
Purity	>99.996%
LinearThermal	6.7x10^-6/℃parallel to C axis 5.0 x10^-6/℃perpendicular to C axis
Refractive Index	1.762~1.770
Near and Mid wave lR transmission	≥85%
Thermal Capacity	0.10(cal/°C)
Thermal Conductivity	46.06@0℃ 25.12@100℃ 12.56@400℃(W/(m.k))
Dielectric Permeability	9.4@300Kat A axis~11.58@300K at C axis