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Any YAG laser experts here ? |
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BillTodd:
I've just been given a pro laser engraver. Its a bit of a monster (150W @ 1084nm 2.2kW psu with cooler) and broken so I'll probably break it, but I thought I d ask if anyone has YAG laser experience. The machine was scrapped with a 'diode low power' fault. I'm guessing this means the 808nm pumping diode has dimmed. So, how easy would this be to replace the pump |
tom osselton:
There are tons of diode laser heads on Amazon I’d check them out. |
BillTodd:
Under the lid .. Playing with the software, I noticed a setting to extend pump diode warning time , so I am crossing my fingers that there are a few blasts left in this thing . |
BillTodd:
Well , the extend warning is only a software thing. The diode pump isn't working :-( I opened the diode pump box and investigated: The pump consists of 6 laser diode banks each with 25 chips . Driving it with a constant current supply I can see a good few chips not working . The voltage across the array was only 9V or so at 2A - given this is driven by a 50A 45V supply , I can see the need for water cooling. |
BillTodd:
BTW these diodes shine down on to the YAG (yttrium aluminium garnet) crystal which is encased in a water jacket for cooling. The red laser light pumps up the electrons in the crystal . When the electrons collapse to their rest state (controlled by a Q switch) they release Infrared photons , which burn the crap out of what ever gets in their way. |
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