This is the beam pattern on my first mirror in front of my laser tube. I am using a new 90W tube, specs below.
What would cause this and how do I fix it?
Cloudray RECI W & T Series CO2 - T2 90W L1210 D65
It looks like a TMO 01, i.e. a bad CO2 tube.
If I’m right, you need to find a new tube.