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I would prefer a raster scanner using the optics from a laser printer. I plan to make one in the future since I'm tired of dealing with printers and transparency masks.
A spatial filter for the laser diode would also probably help.
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
there are single mode diodes like the 445nm 80mW nichia which render a spatial filter useless, and most of those bluray diodes are single mode at the desired power level anyway
I'd be more worried about optics used in the laser printer optics (usually acrylics) which will brown under UV-blue radiation, and coatings not adapted
what you really want to find is a LaserJet IIIP which has a big scanner, big polygon, and GLASS optics!!! (plus this is antediluvian so easily reverse-engineered)
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
it all depends on the type of diode you have and the power you drive it at, as most of the diodes under 100mW are single mode
all you need then is to use a simple correction scheme as an anamorphic prism or a long focal cylinder lens (ir a pair of short focal) to correct astigmatism
lossy glass is better than UV absorbent acrylic ;)
I think you also need to use a collimating lens with a short focal length like the 405-G-2 for low diameter, low divergence, and use a milled copper mount for the diode and lens instead of the crap aixiz basic module, if this is what you used (if not, well, sorry ;) )
The S06J "500mW" 405nm diodes are also single mode and have a nice round beam profile. I had a module (in a moderate heatsink) I made about 18mo ago that ran cool at 450mA and was outputting about 820mW. Had fun with it for a while before it was time to send it off to a customer for their engraver project.
You can still get these diodes mounted in a suitable module with driver installed and current set and your choice of lens from DTR's shop:
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Laser etching
