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Does anyone know where i can buy a diffraction lens that will produce a ring pattern.

I figured a way of using an meniscus axicon and other optics. However the cost of the axicons prevent me from using them. So, Im looking at maybe a diffraction lens with a ring pattern. I cannot seem to locate one though.

You seem wise Cyparagon...and a little crazy. My ultimate goal is to create a circular pattern about 3 inches in size at about 3ft and then be able to adjust the patttern size down to a point at the same distance using optics only. Any suggestions are much appreciated.

I need to change a beam into a circle. The only other way that I have seen to do it is be using a cheap laser head that has a circle lens in it. How do those work by the way? Do you know anyone that makes them?

Im looking for a 3-5mm axicon for around $20? can anyone give me a point in this direction?

How are the pattern heads (cicle, triangle, star, etc.) made that come with those cheapo laser pens on ebay? They look like a thin piece of plastic? how does that change the pattern of the beam?