I noticed the burn mark had changed, before the lens. And upon closer inspection that the laser seems to burn the mirror that is inside the laser tube. At the back of it.
Is this common? It should be properly cooled, as it's the first place where the water hits. And the water in the bucket has never been over room temperature.
I assume there is no way to change the mirror, as it's inside a sealed glass tube with the gasses.
Burnt mirrot inside the laser tube?
Moderator: baker
Re: Burnt mirrot inside the laser tube?
No idea what is going on but it shouldn't look like that. Crap in the tube that finally went to the wrong spot? We just had a failure similar here....on the output lens side and looking at some other broken tubes I noticed one that had a lot of crap on the back side the the lens.