Looking for a lens to produce a circle pattern with a dot in the middle

[adto]

Hi,
I'm looking for a lens that can produce a pattern of a circle with a dot in the middle (like this ⊙ ), which at a distance of 80cm will make the circle have a radius of 1.5cm. Possibly one that doesn't cost much and could be available in bulk. I have found some full laser assemblies that can do that but they cost way too much (hundreds of dollars, where i'm looking for abt 10).
I know this is very specific, but does anybody know where I can look?

Thanks in advance

 

[bostjan]

How perfect of a circle do you need? There are cat toys that come with star caps that do exactly that, but the circle is usually just a ring of small dots. You could adjust the size with a focusing lens.

 

[RedCowboy]

I think you are looking for a diffraction grating like this > https://www.aliexpress.com/item/326...&terminal_id=9521e47cc694430c83311455dac5f57c