Another technology that is also providing high quality and stable beams with great flexibility for the laser user is a hybrid of these two technologies. In this case, the laser source is a diode-pumped crystal with a fiber-delivery system, which homogenizes the beam being delivered to the process. Working with laser marking technologies is just as exciting as the development of laser cutting, welding, additive manufacturing, or any other laser technologies and applications.
However, all lasers are made of matter and matter degrades and eventually fails. These physical changes to the laser system will result in changes in beam quality and beam output power or energy and even the shape and/or size of the beam. And because of this law of nature, the mindset toward the monitoring of the performance of these laser systems should be no different than in any other laser application. The fact is, if the laser is not monitored for performance, there will come a time when the laser user has to deal with expensive technician visits, part replacement, and production down time.
Regardless of the type of laser or the laser’s function, at what times during the life cycle of the laser system should these laser performance measurements take place to ensure a successful long-term laser application?
Let’s examine the laser application known as deep engraving. Deep engraving is needed for certain part marks to ensure that the mark is permanent and visible for long periods of time. In some cases, the specifications of the depths of the marks are actually regulated by agencies overseeing the manufacturing of the products.
The part marks are sometimes covered with a coating or anodizing, which is why the depths are under such scrutiny. As with any industrial process, time is money. So the quicker the part is marked at the desired depth depends directly on the performance of the laser. Laser output power or energy per pulse should be constantly monitored during the development of the laser application AND after the laser is put into production, so that the laser process has a consistently high throughput. In addition, the measurement of the consistency of the laser spot size is crucial, since the area within the laser spot will determine the power or energy density at the workpiece. If either the laser power/energy or the spot size changes over time, so will the laser process.