Sapphire Optics

Sapphire Optics

ECOPTIK provides a variety of sapphire optical component, such as sapphire lens, sapphire window, sapphire mirror, sapphire cylindrical lens, sapphire prism, sapphire light guide, sapphire dome and so on.

Sapphire Optics Descriptions

Sapphire (Single crystal Al2O3) is a commonly used optical material, mainly based on its several characteristics.

  • Ultra-long applicable wavelength band: it can transmit from ultraviolet (UV=150nm) wavelength to mid-infrared (IR=5um) wavelength, and has high transmittance

  • Excellent physical properties: including strength, high hardness, high temperature resistance, friction resistance, and corrosion resistance.

  • Stable chemical properties, such as not being corroded by acids and alkalis.


Sapphire Optics Specifications

Crystallographic

Syngony

Tetragon

Symmetry Class

3m

Lattice Constants

a = 4.758 Å

c = 12.991 Å

Cleavability

(1011), (1120) imperfect

Optical

Refractive Index at ne

1.7771

Refractive Index at nF' - nC'

0.0107

Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C

βo = (0.88 ... 1.28) x 10-5 βe = (0.99 ... 1.39) x 10-5

Spectral Range, microns

0.17 - 5.0

Thermal

Thermal Linear Expansion, °C-1 for ±60 °C

⊥ to c-axis

(3.24 ... 5.66) x 10-6

Thermal Conductivity, W/(m * °C) at 46 °C

⊥ to c-axis

25.2

|| to c-axis

23.1

Specific Heat Capacity, J/(kg * °C)

0.7610 x 103

Thermal Stability, °C

162 ±8

Melting Point, °C

2030

Chemical

Molecular Weight

101.96

Solubility

in water, gram/100 cm3


98 x 1010


Ref. Index vs. Wavelength λ

Wavelength, Microns

Refractive Index no

Refractive Index ne

1.0

1.7545

1.7460

2.0

1.7374

1.7299

3.0

1.7015

1.6920

4.0

1.6748

1.6679


Internal Transmittance Ti (λ) vs. Wavelength λ

Wavelength, Microns

Internal Transmittance

0.2

0.79

0.5

0.97

1.0

0.97

3.0

0.97

5.0

0.45


Sapphire-optics-3.jpg


Application of sapphire component.

Widely used in infrared and far-infrared military equipment, such as: used in night vision infrared and far-infrared sights, night vision cameras and other instruments and satellites, space technology instruments and meters, as well as windows for high-power lasers, various Optical prisms, optical windows, UV and IR windows and lenses, and observation ports for low-temperature experiments are fully used in high-precision instruments and meters for navigation, aerospace, and aviation.


Sapphire window/ lens


Commercial grade

Precision grade

High precision grade

Diameter

1-300mm

Diameter tolerance

±0.1mm

±0.05mm

±0.01mm

Thickness tolerance

+0/-0.1mm

±0.05mm

±0.01mm

Parallelism

<3 arc min

<30 arc sec

<5 arc sec

Surface quality:

60/40

40/20

20/10

Surface accuracy

λ

λ/4

λ/10


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