I found a laser plasma tube that's the daddy of all laser plasma tubes. This early 1980s carbon disulfide tube is a four foot long stainless steel monster that's spent the past 30 years perched on a stump in Bellevue, Washington. The bellows on the ends allowed it to be used in a vacuum chamber, which was necessary because it was cooled with liquid nitrogen running through those channels.
This is a type of laser nobody hears about, because of its application which I won't go into. Maybe later, when I find references for them. Anyway, this one may live on the porch.