Star Wars Episode 3

[Armin]

This is mostly due to the fact that it it isn't reasonable to suggest that you can make a beam of laser light solid and give it a defined shape and endpoint.
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According to the Old sourcebooks from West End Games (for the Star Wars RPG we played more than 10 years ago) this is not how a lightsaber works, though.

In their description, the blade is not, in fact, a strait single beam with an endpoint, but a very narrow parabulum, where an extremely focused beam of amplified light is curving back at the tip and being reabsorbed in the hilt. That's in this line of thought also the reason why they use little to no energy when not actually cutting through something.

So, actually, the blade is an extremey narrow "u-shaped" ray of light, where the photons turn back after 3 feet or so, controlled by some force field. Two blades basically - one outgoing one incoming. Just so close to each other and emitting so much stray light that they appear as one.

They called talk like that "pseudoscientific gobbledygook" for a reason, though ;)