Effects of focus tolerance on the laser beam
The topic of focus/focusing and focus tolerance is experienced directly when laser cutting or laser engraving, as choosing the correct lens for your application is just as important as optimising the focus.
Finer and more detailed graphics that are to be laser engraved require a smaller focal length of the lens. However, if thick materials are to be cut, lenses with a large focal length are recommended. As a practical example on the topic of focus/focusing, we use the 1.5 inch lens for a CO2 laser. This lens with a low focal length allows the engraving of graphics with fine details thanks to a resolution of more than 500 dpi.