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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.
|Lens Form||Plano-concave Lens||Material||CaF2|
|Diameters(mm)||12.7-25.4mm (Standard), or Custom||Working Wavelength Range||180-8000nm|
|Coating||Standard Uncoated, or Custom BBAR/V-coating/MgF2||Surface Quality (S/D)||80/50|
|Irregularity@632.8nm||λ/4||Centering Error||<3 arc min|
|Clear Aperture||>80%||Protective Chamfer||0.2mmx45°|