The beam quality of CO₂ laser tubes is an important indicator of the cutting speed of laser machines. In order to evaluate the quality of the laser beam objectively and efficiently, we are providing a scientific method for our customers. The specific requirements are as follows:

1. Use absolute ethanol to clean the tube lenses and the mirror A, mirror B, mirror C of the laser machines, and adjust the laser beam to the middle of mirror A, mirror B, mirror C.
2. Usually, the effective length of laser beam for laser machines is within the range of 600mm-3500mm, and the working position that are operated most frequently is at 1500-2000mm away from the output lenses. In order to improve the laser processing efficiency and reduce the effect caused by the change of working position, our laser tubes are designed to have the best working condition when positioned at 1500-2000mm (the most frequently used working position). Therefore, when evaluating the beam quality of the laser tubes, users shall not test the laser beam right in front of the output lenses, and shall test it at a distance of 1500-2000mm from the output lenses instead.
3. The reflectivity of the mirrors on the laser machines are relatively high nowadays. Thus, as long as the mirrors are clean and the laser machines are operated properly, the quality of laser beam will not be affected when reflected by the mirrors. Therefore, to make the testing procedure convenient, customers can test the quality of laser beam reflected by the mirrors without removing the laser tubes from the laser machines.
4. When testing the laser beam quality, users shall adjust the working current of the laser tubes need to 25mA, and place a piece of 5mm plexiglass should be placed at the position 1500mm～2000mm away from the output lenses. The plexiglass shall be perpendicular to the laser axis. Aim the laser beam to the middle of the plexiglass until the glass is closed to be burned through. The quality of the laser beam can be evaluated by the taper, shape, roundness, and size of the burned spot. If there is no plexiglass available, users can replace it by other hard materials such as wood or cardboard. In this case, users shall shorten the time that laser beam hits the materials (usually 1-2 seconds), and evaluate the beam quality by the spot shape.
5. When identifying a quality problem of the laser beam, users need to send the pictures or videos of laser spot and product label to our after-sales service department for confirmation, so that our company can deal with it timely.