High Performance Infrared Window , Low Absorption Calcium Fluoride Caf2 Windows

Basic Information
Place of Origin: Wuhan,China
Brand Name: Wuhan Siwer Optics
Minimum Order Quantity: 5 pieces
Price: 20-98USD/piece
Packaging Details: 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler
Delivery Time: 3-5 weeks
Payment Terms: T/T, Western Union
Supply Ability: 1000 pieces/month
Detail Information
Material: Calcium Fluoride(CaF2) Size Tolerance: +/-0.1mm
Chamfer: 0.2-0.5mm Surface Quality: 60/40
Surface Flatness: Lambda/4 In 25.4mm Parallelism: 0.01mm
Standard Coating: Uncoated Or Customized Size Range: 3-120mm
Usage: Infrared System
High Light:

ir window


optical window

Product Description

Calcium Fluoride Windows

Calcium Fluoride (CaF₂) is commonly used for optics looking at the IR and UV spectrums and has a very low change in refractive index with wavelength. It shares similar optical properties with Barium Fluoride, although it has a transmission that is 2.5µm less into the infrared. Calcium Fluoride is however cheaper than Barium Fluoride as the optical grade occurs naturally as opposed to BaF2 being man made.


Calcium Fluoride can be used for many applications, including vacuum ultra violet, ultra violet and infrared thermal imaging. Calcium fluoride is traditionally used in apochromatic design to reduce light dispersion in lenses, both in cameras and telescopes, and has uses in the oil and gas industry as a component in detectors and spectrometers. Calcium fluoride has low absorption and high damage threshold and as it has a low refractive index antireflective coatings are not commonly used making it an ideal choice of material for optics used in Excimer lasers are a form of ultraviolet laser used in micro-machining, eye surgery and micro-machining devices.


Calcium Fluoride is superior to UV Fused Silica in deep UV applications. It has a transmission greater than 75% between 0.15-9µm and transmits efficiently up to about 8µm transmitting over 90%. Calcium Fluoride has a hardness of HK158, which is approximately twice as hard as BaF₂. Calcium Fluoride is not readily degraded under normal atmospheric conditions until 600°C when it starts to soften. In dry conditions Calcium Fluoride has a maximum operating temperature of 800°C. Calcium fluoride can be vulnerable to thermal shock at high temperatures. When calcium fluoride powder is compressed in moulds the resulting material is called Irtran-3.


Price list of some products in stock:

Diameter(mm) Thickness(mm) Unit price(USD)
10 1 5
12.7 2 6
20 1 14
25.4 1 21
30 3 26
32 2 24.5
38.1 3 27
40 2 30
40 3 30
44 3 32
50 3 34
60 3 52


Because the data can't be updated in time, please contact us for the latest data.


Optical Properties of CaF2 Window

Material Calcium Fluoride
Diameter Tolerance +0.0/-0.1 mm
Thickness Tolerance ±0.1 mm
Parallelism 1 arc min
Surface Quality 60-40 Scratch-Dig
Surface Flatness
(Plano Side)
λ/2 at 633nm
Surface Irregularity
(Peak to Valley)
λ/2 at 633nm
Clear Aperture 90%


Calcium Fluoride properties

Chemical Formula CaF2
Crystal Class Cubic, cleaves [111] plane
Lattice Constant, Å 5.46
Density, g/cm3 (20 °C) 3.18
Molecular Weight 78.08
Reflection Loss 5.4% at 5 μm
Absorption Coefficient 7.8 x 10-4 cm-1 @ 2.7 μm
Dielectric Constant for 105 Hz 6.76
Melting Temperature, K 1630
Thermal Conductivity, W/(m K) at 273 K 10
Thermal Expansion, 1/K at 300 K 18.9 x 10-6
Specific Heat, cal/(g K) at 273 K 0.204
Debye Temperature, K 510
Young's Modulus, GPa 75.79
Rupture Modulus, GPa 0.0365
Shear Modulus, GPa 33.76
Bulk Modulus, GPa 83.03
Poisson's Ratio 0.28
Knoop Hardness, kg/mm2 178 [100], 160 [110]


Infrared Elements Selection Guide

High Performance Infrared Window , Low Absorption Calcium Fluoride Caf2 Windows 0

Production process

High Performance Infrared Window , Low Absorption Calcium Fluoride Caf2 Windows 1


Contact Details