Unlike what is generally thought, and even sometimes taught, the construction and workings of a light saber are not secret. So, you might wonder, what is keeping a galaxy-wide firm like Jax-Bethal from mass-producing them, so we can all merrily and effortlessly slice off members from our enemies? The answer is simple: the power supply in the handle. Traditional technology could easily make the blade part, but without the multi-Terawatt Force-operated hand-controlled power supply in the handle it would just be a coil of high-grade glass in a metal-and-ceramic casing.
Which is exactly what it is. The prime component of a light saber blade is a filament of ultra-low-loss glass, about 3 meters long, properly doped, with a perfect mirror at one end and a slightly transparent mirror at the other. The transparent end (called the input end) is connected to an energy source in the handle, and if the filament is perfectly straight, it is easy to see that this set-up is a laser, except that you don't notice so because no power emanates from the free end (usually called the noput end) - the mirror there is perfect.
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