BiConcave lens magnifying glass
The Double Concave Lenses are made from BK7 material, which are manufactured with both surfaces concave. These lenses have negative focal lengths. These lenses diverge collimated incident light and form virtual images, which are seen through the lens. They are often used to expand light or increase focal lengths in existing systems. They are used in laser beam expanders, optical character readers, viewers, and projection systems. We will provide precision grade Double Concave Lenses with tighter manufacturing tolerances.
Technical parameters
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1
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Material
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BK7 or Fused silica
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2
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Diameter
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2-300+/-0.15mm
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3
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surface flatness
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lambda/2,lambda/4
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4
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dimension tolerance
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+/-0.2mm
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5
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focal length tolerance
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+/-2%
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6
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centration
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3arc min
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7
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surface qualtiy
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60-40 scratch and dig
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8
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bevel
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0.2-0.5mm*45degree
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Features：
High Precision Dimension Control,Optional Substrate Material,Diverges incident light Lower spherical aberrations than for Plano-Concave lenses, Ideal for Experimenting and Prototyping Applications
Applications：
Image Reduction and to Spread Light, Laser beam expanders, Optical character readers, Optical Viewers, Projection Systems, Imaging Systems, Laser Measurement Systems.
Description:
A double-concave lens is compose of two concave surface, has a negative focal length and are best used to diverge a converging beam. Similar to a plano-concave lens, a bi-concave lens can diverge a collimated beam to a virtual focus like a beam expander.
Double concave or Biconcave lenses are symmetrical with equal radii of curvature on both sides. The biconcave lenses are used in optical systems in combination with other lenses. These lenses also work as beam expanders, optical character readers, viewers and projection systems.
With its two concaves surface, the biconcave lens refracts light efficiently in a small space and spread widely the light.
Possible to use it for enlarging the illumination area.
Double Concave Lenses are used in beam expansion, image reduction, or light projection applications. These lenses are also ideal for expanding the focal length of an optical system. Double Concave Lenses, which have two concave surfaces, are Optical Lenses with negative focal lengths
Spherical Lens 