...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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