Repairing a Firedragon III

I have a Firedragon III and it stopped working. I heard a rattle inside. I took the lenses out to find the KPT and retaining brass wedge had come free.

My laser is like this one: http://laserpointerforums.com/f52/dinodirect-firedragon-iii-300-mw-updated-59757.html

I have the laser and OC lens mounted on stands with the KPT sitting in its slot with the brass wedge holding it in place. i have the KPT about 1/2 sticking out from the front edge. I have the OC mounted in an optical mount with an adaptor I printed on my 3D printer.

I can adjust the OC to get 532nm to be produced but its not nearly bright enough, at only about 10mw so far on my Kenometer Pro. I am not certain where the KPT has to be positioned for optimal output. the design seems to be such that if the KPT is flush with the slot it will line up with the beam. it seems to matter if the KPT is more forward or towards the crystal.

Does anyone have any experience with repairing this kind of laser? i have the equipment to micro-position the OC. I just need to know where everything has to be in order to get optimal output. the laser was producing about 300mw.

thanks!

Usually the glue breaks when the parts are repeatedly heated up and cooled down.
If you look closer to the brass wedge you will see some glue leftovers. Try to match it with the other part. There is only one way to fit both part.
Or did you already cleaned up the glue ?

Hi Blord. I didn't clean up any glue. I have looked very closely and there is none. it looks like the only thing holding it in place was the wedge. the KPT is very clean with no residue on the sides at all. nor on the brass heat sink.

In that case you have to try both side of the crystal and find out which side gives the best output. We can't give you more advice on that. The crystal has no printing or marking on it.

actually the KPT has hand written on it 626. but i am sure that's no help.

Does it matter where the KPT is laterally in the beam?