Is there a laser type beam that is powerful enough to but through things?

If so perhaps it would be possible to angle two of these beams to meet about 4 feet from the tip of your handle?

Then maybe use the principle of constructive and destructive interference to stop the "blade"?

That is of course if you get passed the miniturization of the power source.

Anything is possible. Our dreams actually drive invention. I know of a guy that did a paper on this concept. Many of todays toys and gadgets were dreamed up in sci-fi books and novels. Literature and imagination drive reality and progress.

What if you make a 'ring' of lasers on the outside of the blade pointed straight up, and aim another 'ring' of lasers on the inside of this cilinder to cross the other lasers at a specific distance from the hilt?
These lasers should be set so that they'd both deflect towards the middle of the blade, where the hilt will magnetically pull the energy back inside of it by the usage of a narrow magnetic/gravitic field to recharge it's own energy supply.
That way the saber would lose little to no energy when no action is going on and only lose energy when it hits something.

They are already thinking of creating micro-black holes by bumping matter into eachother very fast, so why not use those?

Downsides:
-You'd still not be able to hit anything mirror-like.
-You'll have to charge the saber once in a while

it is very possiball to create a lightsaber. just not made out of "laser" but plasma. it is impossiball to heat light up to that degree of heat to cut through things so quick. also humans can not harness light to limit the length of the saber. plasma can be harnessed to limit the length of the saber. same with the blaster pistols in star wars, plasma not laser.
in space shuttles they are replacing the windows with larger thiner and stronger plasma widows. i hope i helped you guys to realize not laser but plasma!

Most of the desktop computers we have today are completely beyond the imagination of the people that built all of the 'super computers' of the past. The only different between fantasy and reality is the availability of the means to get there.
If there was one thing humanity should have learned from Nicholas Telsa by now is that what can be done with energy is limitless. Technology in the 1920s also had more promise than the technological junk that's currently being puked out.
What's impossible today is tomorrow's common experience. Never account humanity to learn from its past though. We'll have lightsabers if and when humanity finally get pas the idea there is such a thing as limitation.

Two things that always made Star Trek and Star Wars so enjoyable and diverse. When someone from those universes saw something they couldn't themselves do, they didn't say, "That's impossible!" They asked who, what, when, where, why, and how. The only one that ever did make that statement in the whole of those series was Luke and Yoda cracked him over the head till he didn't say that again. Wise old thing.

[edit on 28-10-2008 by Old_One]

Technically we could but then again really we couldn't. And to be realistic it wouldn't be a "light" saber, we could make a "plasma" saber though. Light though wouldn't work because for one it doesn't stop at a certain point like a light saber light travels on and on and technically cannot cut through things. We could though take a tube and put plasma in it which when heated would glow neon very much like the real thing which i have seen online but in order to not only make it shine but to cut through metal if we had something that could heat the plasma in the tube to temperatures of up to 200,000,000 degrees then it would be able to cut through metal and pretty much any substance on earth. It would also repel another plasma light saber because plasma particles repel each other so it would be much like a light saber. BUT with our current technology we can't get things even close to being that hot and even if you did it would be so hot it would be more of a hazard to you than to your opponent so for now we'll just have to accept the shiny neon glass tubes we have.