Material: K9, BK7, FS, UVFS, CaF₂, ZnSe
Diameter:3mm-200mm±0.05mm
Center Thickness Tolerance:±0.05mm
Lens Alignment Error:≤3min
Surface Accuracy:λ/ 8 @
Surface Quality:40/20. 60/40. 80/60
Effective Caliber: 90%
Plano-convex lenses are ideal for focusing parallel
rays to one point, and can be used in a variety of applications. They
have a positive focal length, and they have a near-optimal appearance
for infinite and finite conjugate applications. Plano-convex lenses can
converge the collimated beam on the back focus, and can also turn a
point light source into a collimated beam. Plano-convex lenses are
usually used to focus parallel light. The front and rear surfaces of the
plano-convex lens are asymmetric, so it can effectively reduce
spherical aberration, especially in applications where the object image
distance is not equal. The best application is to place an object at
infinity (that is, as parallel light incident) and image in the focal
plane. At this time, the object-image conjugate ratio (ie, object
distance/image distance) is infinite. The convex surface of the lens
should be placed facing the object direction.
Example with BK7 material：These N-BK7 Plano-Convex
lenses are available uncoated or with one of five antireflection
coatings (-A, -AB, -B, -C, or -D), which reduces the amount of light
reflected from each surface of the lens (see the Selection Guide table
below for coating option). Since approximately 4% of the incident light
is reflected at each surface of an uncoated substrate, the application
of an AR coating improves transmission, which is important in low-light
applications, and prevents the undesirable effects (e.g., ghost images)
associated with multiple reflections. Having optics that are AR coated
on both surfaces is particularly desirable for applications utilizing
multiple optical elements. Please see the Graphs tab for additional
coating information.
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N-BK7 Plano-Convex Lens Selection Guide
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Coating name
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wavelength band
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Uncoated
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Uncoated
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A Coating
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350nm-700nm
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AB Coating
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400nm-1100nm
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B Coating
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650nm-1050nm
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C Coating
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1050-1700nm
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D Coating
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1650nm-3000nm
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