Calcium fluoride Caf2 biconcave lens

Fused quartz Biconcave cylindrical lens
  • Biconcave lens is similar to plano concave lens. The focal length is negative, but the light incident in parallel diverges outward. The curvature radii of the two sides of double concave lens are equal. It is generally used for beam expansion and projection.
  • Calcium fluoride (CaF2) has high transmittance from ultraviolet to mid infrared (250nm ~ 7um), so it is widely used in the manufacture of prisms, windows and lenses.

  • Calcium fluoride (CaF2) can be used directly without coating in some applications with wide spectral range. Especially, it has small absorption and high laser threshold. It is very suitable for excimer laser optical system.
Technical parameters
Items Parameters
Material CaF2 (single crystal calcium fluoride)
Radius of curvature ± 1mm - ± 50000mm ± 1%
Diameter 3mm-200mm ± 0.1mm
Center thickness tolerance ± 0.1mm (we can process to ± 0.01mm with high precision)
Center deviation 3′(we can process to 30 ″with high precision)
Surface accuracy λ/ 4 (high precision, we can process to 1 / 10λ)
Surface quality 60/40 (we can process to 10-5 with high precision)
Effective caliber ≥80%
Coating IR AR Coating 3-5μm or according to the custom requirements
spectral curve

In addition, we have thousands of stock of K9 plano convex lens, biconvex lens, plano concave lens, biconvex lens, meniscus lens and so on. The price is preferential and the quality is excellent, which can meet your demand for a small order. 

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