Item: Plano concave cylindrical lenses
Specifications:
Material:
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BK7, Fused Silica, SF10, CaF2, Sapphire .etc.
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Design Wavelength:
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632.8nm
|
Dimension Tolerance:
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+0.0/-0.1mm
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Thickness Tolerance:
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±0.2mm
|
Focal Length Tolerance:
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±1%
|
Centration:
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<3 arc min
|
Clear Aperture:
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>80%(Small Size), >95%(Laege Size)
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Surface Accuracy:
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λ/2@632.8nm
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Surface Quality:
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60/40（General),10/5(High Precision)
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Bevel:
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<0.2×45°
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Coating:
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Uncaoted, AR,PR, HR, etc.
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Cylindrical
concave lens is also called negative cylindrical lens. Like spherical
lenses, they focus light into a line rather than a point. Use a
cylindrical concave lens to spread the light on-axis, and a negative
cylindrical lens to spread out the collimated input light.
Plano concave lenses bend parallel input rays to diverge from one another on the output side of the lens and hence have a negative focal length. Plano concave lenses are the best choice when object and image are at absolute conjugate ratios greater than 5:1 and less than 1:5 to reduce spherical aberration, coma and distortion.
