lens diameter 20mm. focus 63.5 mm.
Replacement lens for laser cutters with a CO2 laser source. Available in different focus lengths. The most commonly used focus lengths are 2 inches and 2 1/2 inches. or 50,8 mm and 63,5 mm.
Lenses with longer focal lengths theoretically have a sharper notch, but the work is further removed from the sphere of influence of the air support. The 50,8 and 63,5 mm. focus lengths are right in the “sweet-spot” for small to medium laser machines (eg type IRIS )
Our lenses are made of very high quality zinc selenide and, unlike some laser lenses on the market, are NOT toxic to the touch.
| Specification | tolerance |
| Effective Focus length | ± 2% |
| size tolerance | Diameter: +0.000 "-0.005" thickness: ± 0.010 ” |
| variation in edge thickness | <= 0.002 ” |
| lens opening (polished) | 90% of the standard diameter |
| surface shape at 0.63µm | Plano: 1 edge 1/2 edge irregularity Radius: variable |
| scratch resistance | 20-10 |
| AR Coating Reflectivity surface at 10.6 µm | <= 0.20% |
The quality of the optics in a laser machine is the most important factor with regard to cutting thickness and cutting quality. Never save on lenses and mirrors! These parts are relatively the cheapest parts in your laser machine but are decisive for the end result.
How do I measure the focus distance?
Determining the focus distance of a lens for your CO2 laser machine is fairly easy with a ruler and a light. Shine a lamp through the lens (bulge upwards) and see at which height the focus point is the smallest. Look on the ruler to see which measure comes closest - this is the focal distance of the lens:
2 inches - 50.8 millimeters
2 1/2 inches - 63.5 millimeters etc.
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