I doubt it will come to any legislation in europe on owning lasers or even components to construct them.
There could be restrictions in their use, which there already are for all practical purposes. Things like interfering with road, marine or air traffic are -already- illegal. So is attempting to blind (or generally maim) someone by any means, unless it's unlikely to actually work.
As it stands there is not even one law in the dutch legal system that uses the word 'laser'. Neither is there any that refers to 'hammer', 'chainsaw', 'axe' or 'knive'. It is obviously illegal to use any of these items to attack people, and you cannot legally go running around hitting people in the face with skillets.
Legal terms are a bit vague, as there is for example a ban on carrying stabbing and clubbing weapons in public. Practially it depends on the situation: if you actually are a chef bringing your own big meat cleaver to the job, that would be no problem. If you are swinging it around on a square on amsterdam it would.
I see little chances that laser could be banned specifically, as in legal terms they'd have to describe what it -does- rather than what it -is-. The only option would be to limit the amount of candela a lightsource can output, which would outlaw things like airplane landing lights, searchlights and such right along with lasers.