Quote:
Originally Posted by Qfwfq
: I'd say that physics lecturer hadn't thought it all the way through.
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To give him his due he did mutter something about having to turn the thing on such that the beam's fourrier series wouldn't be pure and that this would result in there not being a perfect match for destruction so I think I may have besmirched him unduly.
I was only asking this because I was thinking about how it might be possible to make a real-life light sabre. My laser would be shon into a crystal and six or eight beams would emerge from the facets at slightly converging angles (such that they crossed about 1metre away). The clever bit was that half the crystal facets would be slightly thicker than the others such that the path length for the beams emerging from these ones would be a half wave longer than that of the beams that emerged from the other ones at the point where they crossed. Thus destructively interfering at precisely one metre away from the handle of my laser sword. Thus my sword would be 1 metre long and no more. << This doesn't work either>> Thanks for your comments though.
The Vap
