Hey Inge;
We run a flash lamp pumped ESI 5100 YAG - Uv laser drill here in our shop.
However, the cavity is gold not titanium. I've never heard of a titanium
cavity before, or the use of glycol for cooling water. Our unit uses
de-ionized water only to maintain the necessary resistivity / cooling
properties. We've never seen any sort of oxidation / grey stuff as you
mention within our laser's cavity, or anywhere else within the entire
cooling system. You may be correct about the glycol decomposition. It may
even be attacking the metal cavity and precipitating the 'grey' stuff.
Dave S.
-----Original Message-----
From: Hfjord [mailto:[log in to unmask]]
Sent: Monday, October 01, 2007 12:58 PM
To: [log in to unmask]
Subject: 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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