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Dyson explain how it works here:
https://www.dyson.co.uk/discover/archive/2021/inside-the-tech-v15-detect
I expect they have patents which you could find and there is no problem copying for personal use.
They don't use a mechanical scanner, just a lens - and you may have trouble finding that.
You can buy the laser cheaply on Ebay (or Aliexpress).
Be careful - its easy to damage your eyes with these things - don't be tempted to buy a super powerful one !
You will need to ask on a specialist optics forum to get some help with the lens.
MK
Thank you
