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Well, in your context, single-mode = easier to focus and have a small DOT, but lower maximum power.
If you are really interested, read here.
If you are not limited in space, you can just focus the laser and make it closer to the "target". It will make things easier and cheaper.
If you are really interested, read here.
If you are not limited in space, you can just focus the laser and make it closer to the "target". It will make things easier and cheaper.