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Ideally under 30cm but above 1-2cm. I'll have a look into that.

Thanks, so a single element converging lens could produce such small spots? I was wondering if the size of the spot from a beam or imaged point would be limited by the picture taking resolving power of the lens, of if a beam/point dead on center to the center of the lens at a flat angle...

I feel like I've asked this before. Using a general lens, or a microscope objective, can we focus a laser to a much smaller point, say 5 microns or less? Converging the beam, which then diverges rapidly after the smallest point is fine, I'm not talking about keeping it collimated. I'd like to...