Quote:
Originally Posted by Donk
As has been said, light doesn't stop in midair.
Also, two beams of light don't go "clunk" when they hit each other.
The lightsabre is in fact an infinitely-thin, virtually one-dimensional force field generated by machinery in the hilt. It's so thin that as it moves, or as air moves past it, subatomic particles are sliced in half, evaporating in bursts of pure energy.
The energy is generated in the form of ultra-ultra short wave radiation, shorter than gamma rays and highly dangerous. Switching on the lightsabre would be a hightech way of committing suicide if it were not for a second field, surrounding the first. This second field channels some of the energy into the hilt, recharging the battery and making the whole thing self-powered. The remainder is converted into visible light. This makes it safe for the user and means that he/she can see where the otherwise invisible "blade" is at any time - an important feature if you want to avoid slicing anything and everything around you. The frequency of the emitted light is tunable, so the users can set the blade colour to whatever suits them.
The technology behind all this is subject to a level #1 interdict, given the current state of civilisation on Earth. Sorry, people. You'll have to show you're grown up before you can be allowed to play with this stuff. 
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I had an idea similar to this field surrounding the laser.
It was that the hilt had a microwave emitter built into it, that heated and expanded a slice of rubber attached to the very top of the hilt into a burning inflated stick of rubber, about 6,000,000 degrees Celsius, that would melt through flesh and wood, iron, steel, maybe even some hyper-alloys.
You see the microwaves heat the inside of the rubber, and the rubber is a certain fabric built to reflect the microwaves back into the hilt, recharging it, as you said. The rubber heats, and it doesn't burn.
This rubber is generated in a proposed machine that can manipulate the very atoms of an object and turn it into a deferent type of substance all together.
This machine was proposed in an episode of
Visions of the future called
The quantum revolution
This machine is also the cheapest and easiest way to make antimatter, just insert an object, and change it's substance into anti matter, which would be what fuels the microwave transmitter inside the hilt.