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Why Choose an Achromatic Cylinder Lens?
Edmund Optics Inc.

Why Choose an Achromatic Cylinder Lens?

Achromatic Cylinder Lens

Achromatic Cylinder Lenses offer several performance advantages versus traditional cylinder lenses, including superior reduction of spherical and chromatic aberration at the image plane. When used with a LED source, Achromatic Cylinder Lenses are ideal for line generation. Although LEDs are commonly thought to be monochromatic illumination sources, typical LEDs have a FWHM spectral bandwidth of approximately 30nm.

Table 1 compares the line widths of a focused 520nm LED through a variety of achromatic cylinder lenses, and through their standard cylinder lens equivalents. The decreased line width yields higher resolution, increased signal-to-noise, and superior throughput for LED-based scanning devices.

Table 1: Line widths through 12.5mm diameter cylinder lenses of various focal lengths
Focal LengthAchromatic Cylinder LensCylinder Lens
25mm 60μm 275μm
50mm 8μm 77μm
75mm Diffraction Limited (8μm) 45μm
100mm Diffraction Limited (10μm) 34μm

Figure 1 illustrates the effect of spherical aberration through the PCX cylinder lens. The reduction of chromatic aberration by the achromatic cylinder lens is an added benefit but, in this instance, the greatly reduced spherical aberration results in a much thinner line.

Illustration of the effect of spherical aberration through the PCX cylinder lens
Figure 1: Illustration of the effect of spherical aberration through the PCX cylinder lens
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Offered uncoated or with multiple anti-reflection coating options for the UV, visible, or IR spectrum. Achromatic, acylinder, plano-convex, plano-concave, or rod versions available.

Review equations for creating a laser line generator and creating circular beams with cylinder lenses.

Explore the many benefits of achromatic lenses to see why you need them in your optical system.

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