IsaacT
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When it starts out you have one axis that starts out at a smaller beam diameter. Due to the small diameter, it has a higher divergence; bearing in mind the inverse relationship between diameter and divergence.
The other axis starts out with a thicker beam but has a much smaller divergence.
So the small diameter axis increases in size until it becomes the bigger of the two. As they approach equality the diameters become closer and it looks like a square. Then the initially smaller on over takes the initially thicker one and you get the 90 degree turn. From then on, you just see the initially small diameter axis keep gaining more and more size on the other.
I hope that helps you understand the reason. I know it may have been a bit confusing the way I worded it.
The other axis starts out with a thicker beam but has a much smaller divergence.
So the small diameter axis increases in size until it becomes the bigger of the two. As they approach equality the diameters become closer and it looks like a square. Then the initially smaller on over takes the initially thicker one and you get the 90 degree turn. From then on, you just see the initially small diameter axis keep gaining more and more size on the other.
I hope that helps you understand the reason. I know it may have been a bit confusing the way I worded it.
