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Got the mirrors aligned! With it being close to alignment and without an external alignment beam I found the best way to bring it back was to set the power just high enough to cause a visible thermal glow on concrete and then search around. The refraction/reflection pattern I had from the beam...

Here's some photos of the tubes, it takes a long time to pump down and start up so I'll wait until I have a better strategy before I start it again. The melted region on the left of the concrete shows roughly what the beam distribution is currently. It's basically a row of 5 dots with the lower...

Are those alternating connected bands that run down the length of the tube for starting the discharge? I've never seen a tube big enough to need something like that.

I am currently trying to tune up a large fast-axial-flow laser that had been sitting around for years and I am looking for advice, I have had a hard time finding guides on this that have much detail. I have re-aligned the mirrors well enough to bring it back to just over half power (~500W so...