Beam divergence

Alright kiddo, let me explain beam divergence in a way you can understand.

Imagine you have a laser pointer, when you turn it on, it creates a beam of light that comes out in a straight line. This beam of light is very narrow at the beginning, but as it goes further away, it starts to spread out. This is what we mean by beam divergence - the beam of light coming out of the laser pointer spreads out over a larger area the further away it gets from the source.

Just like when you throw a ball, the further you throw it, the bigger the area it covers. The same thing happens with the beam of light from a laser pointer - it covers a larger area the further away it gets from the source.

So, when we talk about beam divergence, we're talking about how quickly the beam of light spreads out as it gets further away from the source. A laser pointer with a low beam divergence means the beam of light stays narrow even when it's far away from the source, while a laser pointer with a high beam divergence means that the beam of light spreads out quickly and covers a larger area as it gets further away.

I hope that helped you understand beam divergence!