Laser LensMinecraft

In laser engraving and laser cutting, striving for optimal results depends on choosing the right lens. This principle is similar to selecting different lenses for close-up and wide-angle shots on a camera. The key distinguishing factor among lenses lies in their respective focal distances, quantified in inches. Focal distance signifies the distance from the lens to the focal point – the point at which the laser beam achieves its smallest diameter before expanding again. A smaller beam diameter translates to higher energy density, creating a more “aggressive” beam. For instance, a 2-inch focal distance implies that maximum intensity occurs when the workpiece surface being cut or engraved is positioned 2 inches (approximately 5.08 cm) below the lens.

Laser lenstypes

This broader focal diameter also leads to a wider line width, facilitating quicker laser cutting of fill lines at a greater distance. The following table offers a general overview of lens applications, though we recommend customizing this information to suit your specific needs.

Determining the appropriate lens relies on a range of considerations: laser power, material type, graphic detail and resolution (dpi), and material thickness. Here's a rule of thumb to guide your selection: Greater graphic detail warrants a shorter focal distance for laser engraving, while thicker materials in laser cutting require a longer focal distance. The following lenses are available for Trotec laser systems:

The depth of field, or focal tolerance, denotes the optimal focus area where the laser beam operates. Longer focal distances result in extended depth of field. Consequently, when using a 5-inch lens, the cut edge of thicker materials appears straighter compared to a 2.5-inch lens. However, a longer focal distance also means a larger laser beam diameter (approximately twice that of a 2.5-inch lens). This disperses the laser's energy (wattage) over a larger surface, reducing heat per unit area. A lens with a greater focal distance can be advantageous for materials sensitive to heat, such as laminates, due to the broader beam diameter.

Standard lens for Speedy 300 flexx. Is transmissive for both CO2 lasers and fiber lasers. Both laser sources can be used without changing the lens.