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4W Argon rainbow coherent laser On Ebay






Always gotta watch out for these. There's no way to know when this was last run and it could need some work before it will fire, or could even need regassing. :(

-Trevor
 
I only have 1 phase 230, if you're not too far, can I take my argon(s) to you to test them? I have a transformer with them.

That coherent laser does look very old, I wouldn't want a $3000 doorstop (although it would stop a door pretty well).
 
That is a supergraphite tube. Its a museum piece. The bore walls are made of a set of hard but porous graphite disks. The graphite disks are held in a quartz tube for vacuum integrity. The optics are "soft coated" whitelight optics and will degrade rapidly. Please believe me that a 1982 or so laser using graphite is best left alone. It is a testiment to Coherent's engineering skills, but nothing more. Graphite tubes are very pressure unstable to begin with.

The graphite glows orange hot and transfers its heat by radiation, not conduction, to the cooling water. Modern tubes use conduction for a reason. As the graphite heats up, becomes powder, and cracks, it adsorbs gas from the fill. That gas can suddenly emerge to become a high pressure issue.

Its worth 50$, maybe, at best. The CR54 psu might be useful if you had other small Coherent heads.

Steve
 
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