Laser pulses are usually fixed: with standard fiber lasers, a pulse has a duration of about 120 ns, while the pulse frequency varies from 20 to 100 kHz.
Instead, with MOPA lasers, pulse duration varies and can be set in a range from 4 to 200 ns, with a frequency ranging from 20 kHz to 1 MHz. The short pulse is especially useful for marking on plastics, as it prevents burning the material by avoiding direct contact.
The initial drawback of this technology could be its price, but the difference with a traditional fiber is so minimal that it is largely compensated by its application flexibility.
However, it is worth specifying that, if we have to mark natural aluminum or die-cast products, a traditional fiber laser may be sufficient to achieve high quality results.
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