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CaF2 Plano-Concave Lenses

  • Flat-concave structure optimized for light collimation and diverging at absolute conjugate ratios > 5:1
  • Substrates made from high purity CaF2 crystals with exceptionally wide transmission from UV to IR (180-8000nm)
  • High laser damage threshold and thermal shock resistance suitable for excimer lasers
  • Standard CaF2 plano-concave lenses are available in uncoated versions, while custom coatings like BBAR, high-performance V-coatings and MgF2 coatings
  • Applications: Infrared Lenses, Ultraviolet Optical Components, Laser Processing such as Excimer Lasers, etc.
Inquire for custom product  
Code Material Diameter CT ET Focal length Coating Unit Price Delivery Cart
1110-001 CaF2 12.7mm 2.0mm 5.3mm -18mm Uncoated Inquire Inquire
1110-002 CaF2 12.7mm 2.0mm 4.6mm -25mm Uncoated Inquire 1 Week
1110-003 CaF2 25.4mm 2.5mm 7.5mm -40mm Uncoated Inquire Inquire
1110-004 CaF2 25.4mm 2.5mm 5.1mm -75mm Uncoated Inquire 1 Week
1110-005 CaF2 25.4mm 3.0mm 4.9mm -100mm Uncoated Inquire 1 Week
1110-006 CaF2 25.4mm 3.5mm 4.4mm -200mm Uncoated Inquire 1 Week
1110-007 CaF2 25.4mm 4.0mm 4.4mm -500mm Uncoated Inquire 1 Week

Plano-concave Lens is a bulk optical singlet with a flat side and a convex side, which contribute to a negative focal length and a negative spherical aberration. Plano concave lens diverges collimated light beams from a virtual focus and could be used to spread a collimated light beam, increase the focal length of an optical system or condense images. Plano-concave lenses are often incorporated into Galilean beam expanders, also as components to increase the focal length of an optical instrument, or balance out the spherical aberration, improving image qualities. When the absolute conjugate ratio is greater than 5:1(that is, the absolute value of objective distance: image distance), a plano-concave lens is the best type of negative lens to decrease spherical aberration, coma, and distortion. 

Calcium Fluoride(CaF2) is an excellent optical material with its natural high transmission from UV to MWIR wavelengths (180-8000nm) with favorably low levels of fluorescence, therefore it is widely utilized in infrared, and ultraviolet optical systems. CaF2 exhibits prominent LIDT(Laser-Induced Damage Threshold), small refractive index, and low birefringence, which permit the usage of CaF2 plano concave lenses to be integrated into excimer lasers and infrared lens groups. Besides, Calcium Fluoride is also more mechanically durable and chemically stable than other fluoride counterparts, the hardness of CaF2 is twice the magnitude of that of BaF2, with the addition that CaF2 is not prone to deliquesce and enduring thermal shock. 

This page highlights Shalom EO’s Stocked and Custom CaF2 Plano Concave Lenses, whilst you can browse and shop Off-the-Shelf N-BK7 Plano Concave Lenses, Off-the-Shelf UVFS Plano Concave Lenses and custom plano concave lenses made from a wide assortment of optical materials including sapphire, ruby, Flint Glass/BaF2/Ge/Si, etc. Shalom EO is a proficient and capable supplier and manufacturer of optical lens components. The calcium fluoride we use to fabricate optical lenses exhibits high purities to ensure minimized OH contents, which are harmful to IR transmission. Shalom EO also leverages a stringent inspection procedure to ensure that the actual parameters of the lenses comply with our published specifications. 

Our CaF2 plano concave lenses (standard) have diameters ranging from 12.7mm to 25.4mm and focal lengths ranging from -18mm to -500mm. These stock CaF2 plano-convex lenses are currently available in uncoated versions, but custom coatings including Broadband AR Coatings (BBAR) with superior broadband performance, V coatings with minimized reflection over a narrow waveband and MgF2 with high price-competitiveness are all procurable through inquiries. The stocked CaF2 flat-convex lenses have a conventional surface smoothness of 80/50 S/D and >80% clear aperture. However, Shalom EO is also capable to manufacture Calcium Fluoride plano concave lens components with higher precision if you have stricter requirements for the final performance. 


Application notes:
1. When using a plano-concave lens to diverge a collimated light beam, the curved surface should face the light source (Or in other words, the flat side should point to the focal plane you intend to modulate) so that light bends gradually and spherical aberration is reduced to the greatest extent. 

Specifications:

Lens FormPlano-concave LensMaterialCaF2
Diameters(mm)12.7-25.4mm (Standard), or CustomWorking Wavelength Range180-8000nm
CoatingStandard Uncoated, or Custom BBAR/V-coating/MgF2Surface Quality (S/D)80/50
Irregularity@632.8nmλ/4Centering Error<3 arc min
Clear Aperture>80%Protective Chamfer0.2mmx45°

Dia25.4mm EFL-200mm CaF2 Plano Concave Lens Uncoated

Dia25.4mm EFL-200mm CaF2 Plano Concave Lens Uncoated

Dia25.4mm EFL-75mm CaF2 Plano Concave Lens Uncoated

Dia25.4mm EFL-75mm CaF2 Plano Concave Lens Uncoated

Dia12.7mm EFL-25mm CaF2 Plano Concave Lens Uncoated

Dia12.7mm EFL-25mm CaF2 Plano Concave Lens Uncoated