Calcium fluoride (CaF2) window
  • Calcium fluoride (CaF2) window
  • Calcium fluoride (CaF2) window

Calcium fluoride (CaF2) window

parameter:

Low solubility and wide transmission range makes it useful for many applications, including: mirror substrate for UV laser systems; substrate for manufacturing windows, lenses for UV, IR applications.



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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 infra-red. Calcium Fluoride is however cheaper than Barium Fluoride as the optical grade occurs naturally as opposed to BaF2 being man made.

Specification



Commercial   GradePrecision GradeHigh Precision Grade
Dimension1mm-600mm
Dimension tolerance±0.1mm±0.025mm±0.01mm
Thickness tolerance±0.1mm±0.025mm±0.01mm
Parallelism<3 arc min<30 arc sec.<2 arc sec.
Surface quality60/4040/2020/10
Surface accuracyλλ/10λ/20
CoatingUpon customer's request




Type No.Diameter
    (mm)
Thickness
    (mm)
BRD-CFW-10x1101
BRD-CFW-12.5x112.51
BRD-CFW-20x2202
BRD-CFW-25x1.5251.5
BRD-CFW-25x3253
BRD-CFW-30x3303
BRD-CFW-38.2x338.13
BRD-CFW-40x2402
BRD-CFW-40x4404
BRD-CFW-50x3503
BRD-CFW-50.8x350.83
BRD-CFW-63.5x563.55
BRD-CFW-75x3753
BRD-CFW-75x5755
BRD-CFW-76.2x676.26
BRD-CFW-80x8 808
BRD-CFW-90x109010
BRD-CFW-100X1010010
BRD-CFW-150X1515015
BRD-CFW-180X2018020
BRD-CFW-200X2020020
BRD-CFW-300X3530035



Calcium fluoride (CaF2) windowCalcium Fluoride is used for optical windows, drilled discs, lenses and prisms in transmision range 0.15-9µm. Degradation due to to moisture in the atmosphere is minimal, and polished surfaces of the CaF2 windows may be expected to withstand several years exposure to normal atmospheric conditions.Since they are nonaxial, CaF2 crystals do not require consideration of axial direction. Because of CaF2 low refractive index, Calcium Fluoride windows can be used without an anti-reflection coating.Calcium Fluoride is attacked by atmospheric moisture at 600°C, where it begins to soften. The top use temperature is 800C, when moisture is not present. Irradiation of Calcium Fluoride windows causes some loss in UV transmission. CaF2 is sensitive to thermal shock.

Typical applications: VUV - UV - IR imaging systems, excimer laser windows, CaF2 viewport, demountable cell windows in spectroscopy and all kinds of lenses. Alkor produces CaF2 windows and mirrors for European manufacturers of gas detectors and gas analyzers.

Maximum diameter of CaF2 windows by Alkor - 220mm (8"). 

Alkor manufactures vacuum UV grade CaF2 windows and lenses (193nm and 157nm) upon request.

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