When I was in college, I took a laser from the EE lab. i put saran wrap over the top of my Bose 501 speaker and taped a little mirror on it.
We aimed the laser at it. WE watched all the amazing light patterns it made on the wall to a Joe Walsh CD for hours.
It makes no light? sure. This one did. a laser pointer makes no light either right?
I do question the illustrations above though.
> WE watched all the amazing light patterns it made on the wall to a Joe Walsh CD for hours. <
Well, yes. A laser does emit radiation that, if in the visible spectrum, will show up as a dot on a wall or whatever. I was referring to the beam itself, as was seen in that Star Trek posting.
Maybe they do exist. I am not an expert on all types of lasers. But I have never worked with a laboratory laser where the beam itself was visible without putting some sort of scattering material in it.