You have got it completely wrong.
There is no laser in a lightsaber. Nor is it a form of plasma held in a field of some kind.
A lightsaber "blade" is actually a elongated vortex of oscillating leptons. Of course, leptonic oscillation results in leptomagnetic radiation - faster oscillation results in shorter wavelengths, and the opposite is also true. In this case, "gamma rays" are being produced and then consumed by the vortex in a continuous feedback loop.
The visible light from a blade is actually emitted from the plasma that is part of the filament propagation from the short-lived gamma-rays within the vortex.
A property of this effect is that a lightsaber can only be ignited in air, as the air in front of the blade becomes part of it as it extends.
It is pretty simple quantum physics in theory. In practice, however, the problem is in maintaining stability within the vortex. You will need to direct the energy through a "lens" of some kind which has a uniform crystal lattice structure. Any imperfection will cause the vortex to break apart within microseconds. (you will have created a particle emitter, that does not feed back into itself = very dangerous and short-lived!!). Creating such a lens is impossible using conventional processes, ... in other words, without using The Force.
:P
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Originally Posted by Novastar
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