Laser power is one of the main parameters that define the functionality and performance of a laser marking system. Higher power lasers enable faster processing speeds and the ability to mark a wider range of materials. However, choosing the right power requires understanding various trade-offs.
For plastic and acrylic marking, power in the 5-20W range is common. Lower power lasers can mark softer materials but require more pulses, slowing throughput. Meanwhile, higher power systems 20W and up mark plastics faster but risk over-marking or damaging heat-sensitive substrates.
For metal markers such as steel, aluminum, titanium, etc., the optimal power is 30-100W, which allows for a good speed balance. It is difficult to adequately remove the metal surface at very low power, and more than 100W is prone to heat affected zone or melting instead of marking.
For materials such as blackened aluminum, plated parts, or lacquer surfaces, a higher power of more than 60W is required to overcome surface reflection and absorb enough power to achieve marking.
For engraving of wood and ceramics, the CO2 laser power of 100W+ is handy due to its absorption efficiency. The infrared wavelength has a large penetration depth and enables complex 3D marking.
Overall laser power selection depends on factors like material type, mark resolution, feature size and depth, maximum speed needs and cost. Testing prototypes with different power levels helps determine the "sweet spot" that optimizes quality and throughput for each application. With experience, integrators can match lasers to specific jobs for best-in-class marking results.
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