
AbstractThe first thing that you learn in school about optics is that the angle of incidence is equal to the angle of reflection. Only a while later we would discover that the whole light thing was a lot more complicated, but this seventh‐grade perspective on optics has proved to be sufficient for laser material processing for decades: Light is a ray, and a focus is a point at which converging rays unite. But meanwhile even in laser technonology we see that wave optics tell us far more.
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