Astronomy Laser Function Pen

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How do these two specs relate to each other? and more importantly, why does it matter? It all comes down to how small the end "spot"(the diameter size of your leaser beam) is at certain distances. This is important because you want to point far, far away and because you want to burn stuff, lots of stuff. Common senses tell us that if a laser beam diameter is small, it can go further and burn with more power than if it is big. Ideally, we want to have small beam diameter at aperture AND small beam divergence.

The extent of ocular damage is determined by the laser irradiance, exposure duration, and beam size. As laser retinal burns may be painless and the damaging beam sometimes invisible, maximal care should be taken to provide protection for all persons in the laser suite including the patient, laser operator, assistants, and observers.