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Bi-concave Lens

Both surfaces of the double concave lens are concave and have the same radius of curvature. A biconcave lens with a negative focal length is usually used to collimate a beam, increase (decrease) the focal length, or enlarge (reduce) the image.

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Both surfaces of the double concave lens are concave and have the same radius of curvature.    A biconcave lens with a negative focal length is usually used to collimate a beam, increase (decrease) the focal length, or enlarge (reduce) the image.


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Basic Technical Parameters

 

Tolerance of Dimension: ±0.05mm  

Surface Accuracy:  1/2λ,λ/4 per φ25.4mm

Centration:≥1′
Surface Quality:  60-40, 40-20, 20-10,10-5
Chamfer:  0.2-0.3mm×45°
Clear Aperture: >90%
Polish: High-precision Polish on Both Surfaces

 

Biconcave lenses are often used in systems to expand the beam of light or to increase the focal length, and can also be used in laser beam expansion, light readers, observers, and projection systems.





"Quality first, customer first, development and innovation"
Nanjing April Electro-Optics Ltd. founded in 2012, is specialized in high-precision cold processing of crystal materials, with sapphire, quartz and optical glass as raw materials. Core products including window, lens, crystal rod, prism, ball, filter, cylindrical mirror, ball cover, and so forth. 

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