For aluminum materials. Its natural oxide layer is hygroscopic. And the thickness will increase over time. So, remove this rough, contaminated oxide layer. To expose the underlying aluminum, it may be sufficient to create sufficient contrast. Another more complicated factor is that the degree of melting or ablation of the underlying aluminum material can significantly affect the appearance of the mark.
By carefully adjusting the parameters of the laser pointer, a brighter surface can be produced to show the fusion effect with improved contrast. By using a pulse energy of ~ 1mJ, it is possible to form a deep color and high oxidation surface on aluminum. However, if you want to obtain a low L * value, you can also obtain a solid, non-fragile surface So that the appearance of the mark does not change with the change of the viewing angle, careful control of the process is required. Increase the ablation level to form a slightly rough surface. Surfaces with deeper colors, higher absorption, and larger L * values ​​can also be obtained. The surface sizes shown are all <10 μm. The surface roughness (Ra) is much lower than <5μm.
The removal of anodized coatings from aluminum surfaces is a widely used technique. The same rule applies to applying lasers on substrates. Strong melting means a more reflective surface. No matter it is bare aluminum or anodized aluminum, the marking speed reaches a high level of 1-2m / s. Recently, laser marking technology on specific anodized coatings has been developed. Using low nanosecond and subnanosecond fiber green laser pointer can obtain L * values ​​of <30. Although its marking speed is much lower than the above method.
The extremely powerful 445nm wavelength blue laser pointer, the maximum output power is 1000mW or 1.5 watts, the laser spot is on the focal point. The front end of the rotating laser pointer can be thicker or smaller to focus the laser spot size, using a blue laser beam. Our new laser diode technology enables this laser pointer with a new wavelength of 445 nanometers to increase the visibility of the 405 NM laser pointer laser beam by 300 times.