Different laser wavelengths, What are the shape of the laser spot?

Different laser wavelengths, What are the shape of the laser spot?

445nm is a multi-mode, rectangular beam;
405nm is an ellipse;
808.980,780,1064,635,650 are square spot;
The rest is almost round.

What is the usage of high quality of spot?
Professional research and detection will have high requirement on the spot quality, if only for entertainment, there is no practical significance.

 



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