Cylindrical lenses are used to correct astigmatism in the eye and in rangefinders, to produce astigmatism, tretching a point of light into a line, they are widely used in bar code scanning, projection optics systems, laser measurement systems and holography.
Cylindrical lenses are available in either plano-concave or plano-convex configurations from Lasertec, Plano-concave lenses have a negative focal length and are used for image reduction or to spread light Plano-convex lenses have a positive focal length, which makes them ideal for collecting and focusing light for many imaging applications.
Cylindrical Lens | BK7 Fused Silica | |
Cylindrical Lens
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BK7 Fused Silica
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Commercial
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Hign Precision
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Material
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Schott N-BK7, H-K9L, Fused silica, Si, CaF2, Sapphire
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Design Wavelength
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546.07nm
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Design Index (BK7)
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1.51680 for BK7, 1.45846 for Fused Silica
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Diameter Tolerance
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+0.0, 0.15mm
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+0.0, 0.05mm
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Paraxial Focal Length
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±2%
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±0.5%
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Cerntration
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<3'
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<1'
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Surface Quality
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60-40 scratch and dig
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10-5 scratch and dig
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Surface Irregularity
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< λ/4
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< λ/8
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Protective Bevel
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0.25 + 0.25, -0.0mm
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0.2 ± 0.1mm
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