- Apr 15, 2022
Damn thats a sweet looking setup. Very nice workI build a cutter head that uses two NUBM44 diodes (i think the V1 variant, they are old).
I used cylindrical lenses to square up the beam near field and used a PBS to add a second diode.
The third diode is just a cheap 660nm diode that runs at low power. Its mixed with a dichroic.
This gives me the ability to line my workpiece up without taking the safety glasses off.
It also is perfectly aligned to the blue beam.
A changeable and adjustable focus (i tried F60 and F30) finishes the beam.
I also added air assist.
This thing is just a beast. I even cuts trough 8mm plywood (granted at multiple slow passes). I would need to get a longer focal length lens for a longer beam waist. F60 is not enough for 8mm plywood.
Fast engraving of anodized aluminum is a piece of cake.
View attachment 74487
This setup should give a smaller spot (i measured <0,05mm in both axies with a F30 lens) than FACed diodes with just one collimating lens.
The FACed diode would need two cylindrical (or more for tighter spaces) lenses to correct the astigmatism of the diode die.
edit. whered you get the waveplate?