BK7 double concave cylindrical lens
Double concave cylindrical lens focus or expand light in one axis only. They can be used to focus light into a thin line in optical metrology, laser scanning, spectroscopic test, laser diode, and optical processor applications.
Technical parameters
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Material
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BK7,Fused silica,Quartz,SF11, and other optical glass
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Length
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0.5mm-400mm±0.02mm
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Focal length
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2mm-1000mm±0.3%
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Width
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0.5-250mm±0.02mm
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Center thickness
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0.8mm-200mm±0.01mm
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centering
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30arc sec
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surface flatness
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lambda/4 at 632.8nm
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Surface Quality
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40/20
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Radius tolerance
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+/-0.3%
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Coating
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Upon customer request
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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 