The principle of laser engraving is to focus a high-power laser beam on the surface of the engraving material, and the material will be instantly heated or vaporized after absorbing the high energy of the laser, thus creating an indentation or even a cut in the working path of the laser beam.
Focus Lens The beamo is equipped with a 30W CO2 laser, where the CO2 gas is sealed inside a glass tube and when the voltage is applied to both ends of the laser tube, the gas is excited producing an invisible laser with a wavelength of 10.6 μm. When the light is emitted from the end of the laser tube, it is a parallel beam of about 5 mm in diameter. Due to the small divergence, the parallel beam can be transmitted inside the machine with little energy loss.
There are three reflective mirrors inside the machine, the first mirror is fixed while the second and third mirrors can be driven by the motor to pan around in order to direct the laser beam to any position on the working table. The second mirror will move forward and backward, which is to control the position of the Y-axis, while the third mirror moves left and right to control the X-axis.
After the third reflection, the laser beam will be directed to the surface of the engraving material. To achieve higher energy density, a glass focus lens inside the laser head will focus the parallel beam of about 5mm diameter to about 0.2mm diameter. If the laser beam is properly focused on the surface of the material, the energy is sufficient to instantly burn through non-metallic materials such as wood, acrylic, or metal materials after anodizing, or stainless steel after specific spray processing.