Re: Time for boffins...
...to figure out how to limit the range the light can travel from a laser pointer. And then make the column of light fully visible, and a bit thicker, give them a nice big handle to hold it with, and maybe give it a nice wooshing sound as it scythes through the air.
<pedant>More of a 60Hz A/C hum I think.</pedant>
So how's this:
<geek>The handle contains a reel of a mono-filament wire of some kind (probably carbon), which ends in a disc. The disc and the handle are both charged to repel each other and thus hold the filament taut. The charge is transferred to the disc at the end via ionisation caused by a powerful laser beam; as a side of effect of the extreme voltages generated there is a St. Elmo's fire effect going at that makes the ionisation path visible, this acts to tell you where the mono-filament is. It's the mono-filament that does the cutting, not the laser, though the beam and the controlled lightning effect will cauterise - to some extent - wounds caused by the wire.</geek>
And there you have it: 3-weeks worth of undergraduate discussion (in 1977) on how to construct a working light-sabre.
Oh look at the men in the smart, white lab-coats...