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Calcium Fluoride lenses

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  • The material of Calcium Fluoride has a wide rang of spectrum (from 130nm to 9400nm) and lower  refractive index. They can be used as ultra-violet and infra-red optics, achromatic lenses in un-visible range.Because of the material with the characteristics of high thermal expansion coefficient and low heat conduction, they are hard to manufacture. But BTMT is able to produce commonly grade and laser grade Calcium Fluoride lenses.

Specifications

Material : CaF2 single crystal
Design Refractive Index: 1.43385 @589.3nm
Refractive Index: 1.400@5um
Focal Length Tolerance: ±0.5%
Diameter Tolerance: +0/-0.10mm
Thickness Tolerance: ±0.2mm
Surface Flatness: λ/10
Centration Error: <1 arcmin
Surface Quality: 20/10-40/20
Clear Aperture: >90% of central diameter
Bevel: Protected
Coating: Without coating