Lens selection techniques for different materials

The choice of field lens for a laser marking machine must be made based on the characteristics of the material to be processed.Metallic materials are suitable for short focal lengths and high energy density field lenses. Non-metallic materials should be used in long focal lengths or flat field lenses to ensure uniformity. Composite materials are needed in dynamic field lenses to meet complex requirements.When selecting a laser, it is important to pay special attention to such factors as focal length, spot size, and wavelength compatibility. Combining these with testing and after-sales service will ensure that you get the best possible marking efficiency and precision.

The effect of field lens on laser marking.

The field lens is one of the core components of a laser marking machine, directly determining the precision and efficiency of the machine.Simply put, the focal length of the field lens, the size of the light spot, and the area of the workpiece all have an impact on the final marking effect.For example, metals require a high-energy-density spot of light, while plastics and ceramics may require a more uniform beam. If the wrong field lens is selected, the result will be either burned material or a fuzzy mark.

The different kinds of materials that can be used to match the type of field lens.

Metal materials.

Metal, such as stainless steel or aluminum, is hard, and typically requires a short focal length field lens (such as an F-theta field lens). This type of field lens focuses the light beam into an even smaller spot, concentrating the energy more, and is suitable for fine carving and deep engraving.But you should be aware that if the processing area is larger, it may be necessary to compromise on the focal length to balance efficiency.

Other materials.

Plastics, wood, and acrylics are best photographed with a flat-field or long-focus field mirror.This type of material is sensitive to heat. The long focal length can expand the processing range and at the same time reduce the deformation or discoloration caused by local overheating.For example, when carving large areas, the uniformity of the flat mirror is an obvious advantage.

Composite materials and special coatings.

Composite materials (such as anodized aluminum and metal plating) require a balance between penetration and surface protection.At this time, a dynamic focusing lens can be used to adjust the focal length, preventing the depth of the markings from being uneven due to the uneven thickness of the coating.

What are the key parameters that must be set to avoid falling into a trap?

When selecting a lens, don't just look at the price. You should pay close attention to the following parameters:

Focus: A short focal length (e.g. 100 mm) is suitable for fine processing, while a long focal length (e.g. 300 mm) is suitable for large-area marking.

2. Spot size: The smaller the spot size, the more concentrated the energy, but the slower the processing speed. For metal materials, it is recommended that the spot size be ≤ 0.02 mm.

3. **Wavelength Compatibility**: Ensure that the field lens is compatible with your laser's wavelength (for example, 1064nm fiber lasers or 10.6um CO2 lasers), otherwise it may damage your equipment.

Practical Suggestions for Choosing a Computer

1. Clarify your needs: First, think clearly about the three points of material type, marking precision, and production volume.

2. "Test before buying in bulk": Many manufacturers will support sample testing. The results of testing on actual materials are more reliable than the specifications listed on a data sheet.

3) Don't ignore post-sale service: Eyepieces are easily damaged. Choose a brand that offers a warranty and technical support to avoid future headaches.