My question is: Is it possible to make laser beams viable midair without smoke? I thought it would be a great idea to have a (second) smartphone or pc screen without having a solid screen. The reason why it has to be without smoke is that smoke would be too dependent on the environment.
If it is possible to make laser beams appear in some way midair (without smoke, just air), would this be possible? I am not sure if its possible with two lasers "collide" or some other way.
Wouter
Answer
It is possible to hit spots in the air with laser pulses from multiple directions in such a way that air molecules in that spot become ionized and emit light, see the technology discussed in this article, along with this demonstration video.
And if you just want a 2D screen rather than a 3D display, then of course you can also just use lasers to project it on a surface, like the "laser projection virtual keyboard" here.
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