Laser beam burn pattern

[arronpatton]

Can anyone take a look at the pictures and tell me if the burn pattern from the laser beam looks a little odd?

This is a 100w tube that has been giving me fits since it arrived at my doorstep. The burn pattern is created by holding a piece of cardboard about 1 inch from the end of the tube while applying a quick pulse at 90% power. I have also noticed that the beam widens as it travels through the reflecting stages. By the time it hits the 3rd mirror, the beam will leave a burn mark in a piece of cardboard almost 0.5" in diameter. The end of the tube has been inspected for debris and cleaned meticulously.

I am officially out of ideas, so any advice would be appreciated.

[Tech_Marco]

Look like that it is a beam alignment issue. Our tech should get back to you about the issue. A possible replacement may be needed.