Can i easily correct a mitsu 500mw beam?

[borgqueenx]

i dont feel browsing to whole that topic about the diode, i just ask if theres a quick thingy i can paste in front of the module, so the beam gets corrected a bit.
Right now it looks pretty awful.
http://d.pr/i/yBJ3

purchased from ebay. cheap ass module, just 2 diodes wich are combined using knive edge.
But meh, i dont have any other options so went for it.
its acceptabe as it is now, but i'd like to correct it a bit if its possible.

[absolom7691]

Not as such. There is a free lunch to be had here but not as simple as sticking something in front of your module without a bit of modding. Planters did an awesome video showing how to clean these up using spatial filtering and Polishedball has already built a sweet module and gotten some very impressive results on his red rig, seen here: http://www.photonlexicon.com/forums/...spatial+filter

[borgqueenx]

well i only wish for the second lens planters used in his video, to make the dot more retangular instead of a line. i dont know if that can be used direct inside or after the module, or that there has to be a minimum distance in the beam for it to be placed?
the wings are not really that much of a problem, they get cut off by the scanners.

[m0f]

Cylindrical lenses are what you're looking for. They need to be fairly close to the diodes, so depends on your module whether you can mount them externally. About 5 - 5.5cm is a good distance, results in around a 4 - 4.5mm beam when used with Dave's 2mm fl collimators, so as long as you have big enough galvo mirrors should work. There will still be wings, but as you say the galvo's clip most of it. More of a problem if you're doing graphics, but ok for beams.

Dave at lasershowparts should have them. May want to consider getting some 2mm fl lenses as well.

[borgqueenx]

Cylindrical lenses are what you're looking for. They need to be fairly close to the diodes, so depends on your module whether you can mount them externally. About 5 - 5.5cm is a good distance, results in around a 4 - 4.5mm beam when used with Dave's 2mm fl collimators, so as long as you have big enough galvo mirrors should work. There will still be wings, but as you say the galvo's clip most of it. More of a problem if you're doing graphics, but ok for beams.

Dave at lasershowparts should have them. May want to consider getting some 2mm fl lenses as well.

Thanks thats really helpful! What are the 2mm fl collimators and where do those go?

[m0f]

They're the first lens in front of the diode (you'd have to open up your module to check it out, but if it's the standard threading and no all glued in).

They're known to work well with the cylindrical lenses, whereas if using the ones included with the modules it should still work, however you're final beam size / divergence may not be optimal. On second though as the 2mm fl lenses are so small, an adjustable diode mount may be needed to get the best out of them, so may be worth a try first without. It's just a bit of a gamble what your final beam size / divergence will be but by adjusting the distance to the cylindrical lenses you can fine tune that to some degree.

[borgqueenx]

hard to check where the diode is exactly.
this is the module i have:
http://d.pr/i/Fprm

unfortunatly the lenses directly on the diodes are glued in as you can see(the black stuff)

The distance from the heatsink boxes the diodes are inside of, to the outside of the module is 5cm in total.

[m0f]

Here's a picture of a dual combiner with the cylindrical lenses to get an idea of how they work. The expand the one axis of the beam which in turn lowers the divergence of that axis.

[m0f]

I see in your picture that it appears that they're knife edged rather than stacked vertically. If your strip is vertical, mounting the lenses will be tricky as would have to be mounted on a vertical riser. Or perhaps you could mount your module sideways..

[borgqueenx]

the line of the laser is horizontal when i tested it. see picture of post 1.
after galvo's, its vertical. http://d.pr/i/zq5D
well if the lens is big enough cant i like....put it on there with soft gloves and when the distance is ok put some glue on the bottom of the lens china style?