A couple of great laser lens references. First simple, second in depth.

Lasers
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A couple of great laser lens references. First simple, second in depth.
@Scott_Thorne The Basic Laser Optics has your beam pattern in it. It is totally normal!

http://www.lasercomponents.com/de/?embedded=1&file=fileadmin/user_upload/home/Datasheets/lc/applikationsreport/lens-theory.pdf&no_cache=1

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Yup…tem10…donut of power…
Lol