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IR Windows Calcium Fluoride CaF2 Windows

Calcium Fluoride windows and lenses for UV and IR spectrum. Custom made CaF2 windows, CaF2 lenses and wedges according customer's specifications. CaF2 windows up to 220mm diameter; CaF2 wedges, prisms and CaF2 mirrors; Excimer CaF2 optics, Raman grade CaF2 optics and etc.

  • product origin:

    China
  • shipping port:

    Fuzhou China
  • lead time:

    4 working weeks
  • payment:

    T/T Payment, Western Union
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  • description

Q: What’s Calcium fluoride used for?


Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7μm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride's low index or refraction allows it to be used without an anti-reflective coating. The Knoop hardness of calcium fluoride is 158.3. Calcium Fluoride (CaF2) Windows manufactured from vacuum UV grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.


Uni-Optics provide artificially-crystallized calcium fluoride components available in UV grade and IR Grade.


Specifications:
 
Material: Calcium Fluoride single crystal ( UV or IR)
Diameter Tolerance:  +0.0, -0.1mm
Thickness Tolerance: ±0.1mm
Clear Aperture: >85%
Parallelism: 3 arc minute
Surface Quality: 60-40 scratch and dig
Wavefront Distortion: per 25mm @633mm
Bevel: Protective ( <0.2mm x 45° )
Coating: Optional
 
Standard CaF2 Window
 
Round Shape:
Φ4x0.5  Φ6x1  Φ8x1    Φ10x0.5  Φ10x0.5  Φ12.7x1  Φ15x1  Φ18x1  Φ20x2  Φ25x1  Φ25.4x1  Φ25.4x2 
Φ25.4x3  Φ30x2  Φ30x3  Φ38.1x3
 
Note for CaF2 Window:
(1). Please specify IR or UV when ordering.
(2). Custom-made CaF2 windows at any size are available. Besides round, CaF2 windows at shape of quadrate,
      triangular, or other polygonal are available. Uni-optics can provide dia. 150mm max.
(3). Typical thickness is 1mm 2mm, 3mm, 4mm, other thickness from 1.0mm to 20.0 mm is available.
(4). Better bevel is available upon request.
(5). CaF2 Windows with Anti-Reflective(AR)


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1、What Metallic Coated types can Uni-Optics supply?


Uni-Optics mainly offers four coating types, including:

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



2、What are features of Metallic coated mirror?


Metallic coated mirror have many key features below:

Wide spectral range

Not sensitive to the incidence angle and polarization state

Low cost

Non-durable

Relatively low reflectance

Low laser damage threshold


3、What UNI Optics can do for you?


Common Specifications:

Substrate Materials: N-BK7, Fused silica, Pyrex;Float glass

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 pay very attention to clean, and the cost is very high.




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