I managed to get ahold of a COHERENT I-90-M laser ...  supposedly a 5 watt tube at 40 A at 230V

after studying the existing pieces parts I came to the conclusion that there was parts missing and shorted out electronics

sooo...  the fun stuff began ...   I basically remade the power supply and used some rather large resistors to drive the base of the pass bank

here are some pictures of the tube running




the laser COHERENT  I-90- M  being driven by a home made power supply  with a 250 ohm resistor driving the base of the pass bank
what I gathered from the Coherent web site was that this thing is a 5 Watt output tube






here it is at 230VDC input with 220VDC across the tube running at 15A on the tube side  (( thats a Cyonics SLB in the background...  and behind the beam is the beginnings of a CO2 laser))





 a close up of the output end of the tube running at 220VDC at 15A with the lights off






a view of the beam "down view" running at the same previous power






another view of the beam running at the same power going away from the beam ( following beam travel)
and yesss.....   that is a TRIMEDYNE 25 watt laser off to the left of the picture  :)






a shot of the beam reflecting off of the back side of the house   ( still at 220VDC @ 15 A )







a bit more power added    240VDC @ 20A tube wise burning a piece of walnut wood







some more power ...   250VDC @ 25 A  lighting a cigarette as soon as it is placed into the beam








a low power test of reflecting the beam into a vial of rhodium (?) dye  it produces blue light after it passes thru it ...






Some Pictures of the laser with multi prisms














































caught this one off of the edge of the prism  :)