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astronomy laser energy levels

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How do these two specs relate to each other, and more importantly, why do they matter? It all comes to how small the little dot (the diameter size of your leaser beam) is at certain distances. This affects how far away you can point and see the beam and how much power it will have, for example to burn through things. Common sense tells us that if a laser beam diameter is small, it can go further and burn with more power. Ideally, you want to have small beam diameter at aperture and small beam divergence.