Well, I got one of them, one was different than the others, q-switched 532nm (green) output instead of the 335nm (uv) that most of them are. Found a couple problems. One was the coax connector for the q-switch in the AMP connector was pushed back in where it would not make contact. Second one of the CPC water connectors on the head was broken internally and ways probably not letting full flow, if any. So I fixed these two issues. I also got a couple thermoelectric chillers, both were prototypes from china for a local laser company that used these heads. I found the pinouts for the chiller connector on the power supply on laserfaq.org.
Darn thing works. Has 1489 hours on the head. According to the built in power meter I am getting a pretty stable 6.5 watts at 10khz. An external power meter head is telling me over 7 watts. Don't know what to believe, I will stick with the lower of the two. I am thinking the two problems I found might have been why the head was taken out of service. Seems to be outputting what it was designed for from the label.
Yes, I do have laser googles. OD11 & 514nm.
Couple of pics. Firing it onto a piece of EDM graphite.
![Image](http://farm6.staticflickr.com/5195/7431268196_7b3af90da9_c.jpg)
IMG_2282 by macona, on Flickr
![Image](http://farm8.staticflickr.com/7117/7431267686_6c1bc0d676_c.jpg)
IMG_2283 by macona, on Flickr