Not all lasers are identical
There are two ways to create microvias: conventional mechanical drilling and a laser-based process. The major advantage of mechanical bits is that the complex mix of materials presents no problems. On the downside, they cannot achieve diameters less than one-tenth of a millimeter, they can drill only about 20 vias per second, and they wear out within minutes.
2015-02-13 Ringier Metalworking

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