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I've become interested in lasers and this question came to me today. Let's say we have two 10 mW lasers. One has a spot size of 1mm and one has a spot size of 10mm. Therefore, the first laser has a greater intensity. In classical physics we are told the wave amplitude increases. In modern physics we have more photons. Do either of these concepts relate to spot size (cross sectional area of a laser beam)? Also, what determines the spot size of a laser from a functional point of view? - Thanks