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Lasers are famous for their focusability. (As in: “laser-focus.”)

That’s why many laser power sensors have 30, 20, or even just 10 mm apertures. This is usually more than enough space for a laser beam.

But what about large lasers like diode stacks or non-laser light sources? How can a small sensor measure a large laser beam?

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With high power lasers, there’s always a safety concern for equipment and people nearby.

(Of course, I’m not qualified to give a detailed analysis of what needs to be taken into account for laser safety. For that, you should consult a laser safety officer.)

I want to specifically ask whether there’s an issue of laser light reflecting off power measuring equipment.