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CaF2 Plano Convex, Plano Concave Lenses

Featured Product from Hangzhou Shalom Electro-optics Technology Co., Ltd.

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Features:

  • One spherical side and one planar side optimized for light collimation and focus 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-convex lens and CaF2 plano-concave lens are available in uncoated versions, while custom coatings like BBAR, high-performance V-coatings, and MgF2 coatings
  • Applications: Infrared Optics, Ultraviolet Optical Components, Laser Processing such as Excimer Lasers, etc.

 

CaF2 Plano-convex Lens and CaF2 Plano-concave Lens are available both in stocked and custom versions in Shalom EO.

Plano Convex (PCX) Lens is an optical lens with one plane face, one convex face, and a positive focal length, utilized for collecting, focusing collimated lights, collimating lights from a point source, or reducing the focal length of a lens group. 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. It could be used to spread a collimated light beam, increase the focal length of an optical system, or compress images. 

Calcium Fluoride (CaF2) is an excellent optical material with its high natural 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 convex lenses and 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. 

Shalom EO’s CaF2 off-the-shelf plano convex lenses have diameters ranging from 12.7mm to 25.4mm and focal lengths ranging from 20mm to 1000mm, whilst our off-the-shelf CaF2 plano concave lenses (standard) have diameters ranging from 12.7mm to 25.4mm and focal lengths ranging from -18mm to -500mm, while other custom specifications might be arranged. The stocked Calcium Fluoride plano convex lens and Calcium Fluoride plano concave lens 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 standard precision levels are λ/4@632.8nm irregularity, 80/50 S/D surface quality, and >80% clear aperture. However, Shalom EO is also capable to manufacture Calcium Fluoride plano-convex lens components with higher precision if you have stricter requirements for the final performance. 

Besides,  you can browse and shop Off-the-Shelf N-BK7 Plano Convex/Concave Lenses, Off-the-Shelf UVFS Plano Convex/Concave Lenses, and custom plano convex/concave lenses made from a wide assortment of optical materials including sapphire, ruby, Flint Glass/BaF2/Ge/Si, etc. on our website. 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.

Application Notes:
1. Compared to Biconvex or Biconcave lenses, Plano-convex or plano concave lenses have two unidentical sides and therefore work best for an infinite absolute conjugate ratio (objective distance: image distance). However, plano-convex lenses still reduce spherical aberrations to a quite low extent when the absolute conjugate ratio is greater than 5:1. 
2. In a plano convex lens, because the refraction angles of the incident lights have a slight difference, the focal length of the two sides is also different. To minimize spherical aberration, Shalom EO suggests that when using a plano convex lens to focus collimated lights, the collimated lights should be projected to the curved surface of the lens; conversely, when using the lens to collimate a point light source, the light source should be incident on the flat surface.
In a similar manner, when using a plano-concave lens to diverge a collimated light beam, the curved surface should face the light source so that light bends gradually and spherical aberration is reduced to the greatest extent.
3. Simplified Calculation of Focal Length of a Plano Convex Lens: focal length = R/(n-1), where R is the radius of curvature and n is the refractive index.