Laser lenses are used in most CO2 laser systems to focus all the beam’s power into a very small spot. Small, focused spot size is important for a couple of reasons: cutting, welding and heat treating generally call for high-power density, and power density is a strong function of spot size. (Reduce the spot diameter by 50% and the power density increases by 200%.) Also, many jobs demand narrow kerf widths and heat affected zones, which can only be achieved with a tightly focused beam.
The design variables that will affect the performance of a CO2 laser lens are: Lens material, focal length, diameter, shape, material and coating.
Product: co2 laser focus lens
Material: CVD ZnSe
Design Wavelength: 10.6 um
Focal Length Tolerance: ±1%
Diameter Tolerance: +0.0 / -0.12 mm
Thickness Tolerance: ±0.2 mm
Surface Accuracy:
Surface Quality: 20-10 scratch and dig
Centration: <3' arc minutes
Clear aperture: >90%
Beveling: <0.2 x 45°
AR/AR Coating: R<0.5% per surface @10.6um
Lens
Material:
CVDZnSe is the most popular optical material
used for producing co2 laser focus lens. It has very high light transmittance
which can assure the smallest power wastage during tansmission. Due to different
procedure, we can get PVDZnSe and CVDZnSe. Much less impurity makes CVDZnSe
becomes the most popular raw material for making co2 laser lens.
Focal Length
Focal length affects both spot size and depth of focus. In general, a shorter focal length will produce a smaller focused spot and a shorter depth of focus. Usually, the specified focal length is a compromise between desired spot size, penetration depth and workpiece clearance.
Lens Diameter
Higher power lasers require larger diameter lenses to prevent thermal overload. At any given focal length, a larger diameter lens will yield a smaller focused spot if the incoming beam is expanded to fill the larger lens.
Lens Shapes
Plano-convex is the simplest and least expensive lens shape. It is used in such applications as welding where achieving the smallest spot size is not critical, or at relatively long focal lengths when more complex shapes would not be beneficial. A plano-convex lens should be oriented with the flat side toward the workpiece and the convex side toward the laser. Meniscus lenses have a concave curve on one side and a convex curve on the other. At relatively short focal lengths, a meniscus lens will yield a smaller focused spot than a plano-convex lens. However, meniscus lenses are more expensive to manufacture than plano-convex lenses because both sides are curved. A meniscus lens should be oriented with the concave curve toward the workpiece.
Why you choose SPT co2 Laser focus lens?
1. SPT co2 laser focus lens is made of high purity USA CVD ZnSe, which is from DOW chemical, the largest lens material supplier in the world. Co2 laser lens made from high quality ZnSe comes with very high light transmittance which won't weak your laser power when laser light goes through it.
2. All SPT laser co2 laser lens is made in Meniscus shape, which has much better focusing effect than cheaper plano-convex co2 laser lens. Meniscus shape lens will enhance your laser power to help you get faster cutting speed.
3. To assure laser lens quality, SPT laser send their laser lens to the USA or Singapore for coating. So the coating film on our lens won't come off, this promises your co2 laser lens lifetime.
 |
Dia (mm) |
Focus
Length |
Thickness (mm) |
Model No. | Dia (mm) |
Focus
Length |
Thickness (mm) |
| SPT12.7-2.0-1.8 | 12.7 | 50.8 | 1.8 | SPT20.0-3.0-2.0 | 20 | 76.2 | 2.5 |
| SPT14.5-1.5-1.8 | 14.5 | 38.1 | 1.8 | SPT20.0-4.0-2.0 | 20 | 101.6 | 2.5 |
| SPT14.5-2.0-1.8 | 14.5 | 50.8 | 1.8 | SPT1.0''-2.0-3.0 | 25.4 | 50.8 | 3.0 |
| SPT15.26-1.5-1.8 | 15.26 | 38.1 | 1.8 | SPT1.0''-2.5-3.0 | 25.4 | 63.5 | 3.0 |
| SPT16.0-1.5-2.0 | 15.26 | 38.1 | 2.0 | SPT1.0''-3.0-3.0 | 25.4 | 76.2 | 3.0 |
| SPT16.0-2.0-2.0 | 15.26 | 50.8 | 2.0 | SPT1.0''-4.0-3.0 | 25.4 | 101.6 | 3.0 |
| SPT18.0-1.5-2.0 | 18 | 38.1 | 2.0 | SPT1.0''-5.0-3.0 | 25.4 | 127 | 3.0 |
| SPT18.0-2.0-2.0 | 18 | 50.8 | 2.0 | SPT1.1''-2.0-3.0 | 27.94 | 50.8 | 3.0 |
| SPT18.0-2.5-2.0 | 18 | 63.5 | 2.0 | SPT1.1''-2.5-3.0 | 27.94 | 63.5 | 3.0 |
| SPT18.0-3.0-2.0 | 18 | 76.2 | 2.0 | SPT1.1''-3.0-3.0 | 27.94 | 76.2 | 3.0 |
| SPT18.0-4.0-2.0 | 18 | 101.6 | 2.0 | SPT1.1''-4.0-3.0 | 27.94 | 101.6 | 3.0 |
| SPT19.05-1.5-2.0 | 19.05 | 38.1 | 2.0 | SPT1.1''-5.0-3.0 | 27.94 | 127 | 3.0 |
| SPT19.05-2.0-2.0 | 19.05 | 50.8 | 2.0 | SPT1.5''-3-4.0 | 38.1 | 76.2 | 4.0 |
| SPT19.05-2.5-2.0 | 19.05 | 63.5 | 2.0 | SPT1.5''-5-4.0 | 38.1 | 127 | 4.0 |
| SPT19.05-3.0-2.0 | 19.05 | 76.2 | 2.0 | SPT1.5''-7.5-4.0 | 38.1 | 190.5 | 4.0 |
| SPT19.05-4.0-2.0 | 19.05 | 101.6 | 2.0 | SPT1.5''-5-0.31'' | 38.1 | 127 | 7.87 |
| SPT20.0-1.5-2.0 | 20 | 38.1 | 2.0 | SPT1.5''-7.5-0.31'' | 38.1 | 190.5 | 7.87 |
| SPT20.0-2.0-2.0 | 20 | 50.8 | 2.2 | SPT1.5''-5.0-0.35'' | 38.1 | 127 | 9.00 |
| SPT20.0-2.5-2.0 | 20 | 63.5 | 2.2 | SPT1.5''-7.5-0.35 | 38.1 | 190.5 | 9.00 |
Pls send your inquiry to: dgspt@laserwd.com
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