Does your cooling system uses a deionizing bed? Is it time to replenish this
bed? Laser rod and mirrors operating at from -55C to whatever: that should
play havoc with the beam shape and collimation as I would expect the
reflecting surfaces to "distort" when exposed to such large temperature
changes.
Most flashlamps put out a lot of UV radiation also and that might by
unhealthy for anything from plastics to glycol. 

Have fun "old-timer".
Ahne.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Monday, 01 October, 2007 09:58
To: [log in to unmask]
Subject: [TN] I don't expect much answers on this....

...but I'll try. TNetters are full of surprise. Laser cavity, silver
mirrors, YAG rod. Circulating liquid is water/ethanol glycol fifty-fifty.
After some time, the output goes lower because the mirror becomes
contaminated. When you open the cavity and pour out the cooling liquid, you
find the walls of the Titanium cavity covered with grayish stuff. I suspect
that the flash lamp high intensity light decomposes (oxidizes) the glycol.
I'd rather use fluorcarbon inert,like FC77 which also can work lower than
minus 55 Centigrades. Question: anyone seen something else than water/glycol
as cooling medium around the rod? And what do you think of my theory on
decomposition of the glycol? Abcd?

Thanks in advance 

Inge

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