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Duralens™ Focusing Lenses
The focusing lens is the last optic in the laser path, before
it hits the workpiece. Its main role is to focus the laser
beam to a specific focal length (FL) - depending on the application.
Therefore, the focal length - that is dictated by the radiuses
and curvatures of the lens - is its most important feature.
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The focusing lens is normally made of Zinc Selenide (ZnSe)
using an anti-reflective coating. Focusing lenses are either
Plano-Convex or Meniscus.
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In order to ensure that your laser operates
at maximum efficiency it is crucial to select the right
lens. The type to be used with each machine is usually
specified in the machine manufacturer's manual.
Ophir offers a wide range of standard and special lenses
assuring that the most suitable and effective lens be
fitted to your laser cutting machine. |
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Duralens™ Lenses - A Cut Above
The Rest
The Ophir Duralens™, introduced in 1996, is manufactured using
in house technologies (inspection of raw material, grinding,
polishing, coating and quality control) that were developed
to ensure high reliability and long life - saving you time
and money. Ophir Duralens™ have superior Anti-Reflective (AR)
coating, lower absorption, better surface quality (achieved
by Ophir's micropolishing techniques) and maximum focus accuracy.
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Black Magic™ Low Absorption Lenses
The Black Magic™ lenses are unique products offered by Ophir.
The revolutionary black coating developed by Ophir enhances
the resistance and performance of the lens.
Advantages of the Black Magic™ Lens: |
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Lowest absorption (lower than 0.15%). |
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Saves up to 20% of gas consumption. |
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Lasts twice the lifetime of a standard
lens. |
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Best ability to withstand back splatter. |
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Less maintenance - extended lens cleaning
intervals. |
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Black Magic™ lenses
and black coated optical elements in the catalog are marked
by the letters LA..
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Meniscus Lenses
Meniscus lenses have one concave surface and one convex surface.
A meniscus lens creates a smaller beam diameter thus reducing
the spherical aberration and beam waste when precision cutting
or marking. The lens also provides a smaller spot size that
creates the same power output in a smaller area. In order
to achieve the smallest spot size the concave side of the
lens is mounted face down, pointing towards the material being
cut.
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Although meniscus lenses are more expensive
than Plano-Convex lenses, they offer a higher accuracy
of the cut therefore increasing cutting speed by up
to 5%.
Meniscus lenses are usually used by European customers
and machine manufacturers (OEM's).
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Plano-Convex Lenses
Plano-Convex lenses have one flat surface and one outward
curving surface.
These lenses are more suitable for high turnover cutting applications
and when cutting and welding certain materials (metals, wood,
ceramics, plastics and composites) - when the cost is more
important than the level of accuracy.
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When cutting steel and other thick materials,
a Plano-Convex lens provides a greater width of the
cut enabling the laser's Oxygen assist to enter and
ease the cutting process.
In addition, Plano-Convex lenses give a greater depth
of field needed to maintain a taperless edge when cutting
thicker materials. This kind of lens is more popular
in American and Japanese machinery.j |
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