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Laser is rotating fast enough so it is less dangerous. Also laser current is modulated, so laser's average power decreased twice.

Which safeguards are implemented to detect that rotation and modulation are taking place as intended?

I was just going to mention the THERAC 25: https://en.wikipedia.org/wiki/Therac-25

Now that is a question only a true engineer would ask.

(If you didn't ask the same question then demote yourself down to "Computer Nerd")