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AR Coated Sapphire Windows

Sapphire window retains its high strength at high temperatures, has good thermal properties and excellent transparency. It is chemically resistant to common acids and alkali at temperatures up to 1000 °C as well as to HF below 300 °C. These properties encourage its wide use in hostile environments where optical transmission in the range from the vacuum ultraviolet to the near infrared is required.
  • product origin:

  • shipping port:

    Fuzhou China
  • lead time:

    4 working weeks
  • payment:

    T/T Payment, Western Union
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  • description

Sapphire Windows are manufactured from single crystal sapphire, 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.

Common Specifications

Abbe Number (vd): 72.24

Birefringence (no-ne): 0.008 for Visible Light Orthogonal to Optical Axis

Clear Aperture (%): ≥90

Coating: Uncoated

Coefficient of Thermal Expansion CTE (10-6/°C): 8.8

Density (g/cm3): 3.97

Index of Refraction nd: 1.77

Orientation of Axis: Random

Parallelism (arcmin): ≤3.5

Poisson's Ratio: 0.27

Substrate: Sapphire (Al2O3)

Surface Flatness: 2λ(typical)

Surface Quality: 80-50

Surface Roughness (μm): 0.1 per Inch

Wavelength Range (μm): 0.2 - 5.5

Wavelength Range (nm): 200 - 5500

Young's Modulus (GPa): 435

Knoop Hardness (GPa): 1900


Transmission in 0.3-5.0μm, no absorption in 2-3μm 
Extremely hard and durable 
High thermal conductivity 
High bulk damage threshold

Note for Sapphire Window:

(1). Custom-made Sapphire windows at any size are available.
Besides round, Sapphire windows at the shape of quadrate, triangular, or other polygonal are available
(2). Other thickness from 0.5mm to 50.0 mm is available upon request.
(3). Better bevel is available upon request.
(4). Windows with Anti-Reflective(AR)

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Product Features:

1. Compatible for 2/3'' Format Sensor

2. Ultra-compact Design

3. Ultra Low Distortion

4. High Relative Illumination

5. High Cost Performance

6. Supply with Focus and Iris locking screws.

Product information: Custom designs are available upon request.

Download the datasheet of UN-TFA0614C

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1) UV Enhanced Aluminum : Ravg > 85% from 250nm to 400nm

2) Protected Aluminum: Ravg > 87% from 400nm to 800nm

3) Protected Silver: Ravg > 95% from 400nm to 20um

4) Protected Gold: Ravg > 98% from 650nm to 16um

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Metallic coated mirror have many key features below:

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Common Specifications:

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Dimensional tolerance: +/-0.1mm

Surface quality:  60-40

Parallelism:  3’

Flatness: λ/4 per 25mm@633nm

Bevel: Protective

One surface: Polished and Metallic coating

The other surface: Fine ground

Note: Aluminum is the most widely used metal reflection film, from near UV to near IR, have high reflectivity, and with low cost. Silver has higher reflectivity in the visible and near infrared wavelength than the aluminum film, but the silver in the air will be rapid oxidation, color darkening, makes the film performance and firmness declined rapidly. Gold film has a good consistency with high reflectivity in the near, middle and far infrared range, can control the thermal radiation effectively, but it is relatively soft, easy bruising, and should be paid very close attention to clean, and the cost is very high.

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