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CaF₂ blank Ø204x36mm for a 200mm Fluorite Quadruplet Polychromat
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CaF₂ crystal
Home / Products / Back / Calcium fluoride

Calcium fluoride (CaF₂)

CaF₂ with unsurpassed properties

The outstanding importance of fluorite for the color correction of optical systems is due to an extremely low dispersion, a high anomalous partial dispersion and an even greater Abbé number compared to the fluorophosphate glasses.

Advantages vs. to fluorophosphate glasses

Fluorite allows with the selected mating optical glasses an extremely broadband correction of aperture and Gaussian error, whereby only the transmittance of the optical glasses limits the usable spectral range.

Transmission from VUV to IR

Another important property of CaF₂ is the high transmission over a very wide spectral range from 130nm to10µm (depending on the substrate thickness).

CaF₂ – an ideal optical material

Fluorite is physically and chemically stable and resistant to water and chemicals.

Fluorite optics up to 400mm aperture

Since CaF₂ is available in much larger dimensions than the FK or ED glasses, fluorite optics with apertures up to 400mm can be produced.

CaF₂ offers in VUV, UV, VIS und IR

APQ JENA offers CaF₂ blanks and components in various optical qualities and with customized specifications for imaging optics in microscopes, telescopes, astronomical refractors, spectrometers, 4K/8K TV lenses and for excimer lasers, etc.:


  • VUV CaF₂
  • UV CaF₂
  • UV VIS IR CaF₂

Optical quality

Transmission¹:
on request

Crystal orientation:
<111>, Random

Homogeneity:
on request

Stress
birefringence:

on request

¹ at 157nm
² 193nm

Specification

Diameter:
≤250mm

Thickness:
≤100mm

Applications:
VUV, ArF excimer laser²


Optical quality

Transmission³:
on request

Crystal orientation:
<111>, Random

Homogeneity:
on request

Stress
birefringence:

on request

³ at 193nm
⁴ 248nm

Specification

Diameter:
on request

Thickness:
on request

Applications:
KrF excimer laser⁴, beam delivery systems


Optical quality

Transmission⁵:
on request

Crystal orientation:
<111>, Random

Homogeneity:
on request

Stress
birefringence:

on request

⁵ at 546nm

Specification

Diameter:
≤440mm

Thickness:
≤130mm

Applications:
Microscopes, digital cameras, telescopes, filters, astronomical refractors, IR night vision equipment, spectrometers



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