Considering the power levels needed for a cutting laser or plasma cutter to actually cause damage to known materials, in a bean 1 inch wide, its hard to imagine what kind of battery would fit into a handle small enough to hold to power a plasm channel rod 36 inches in length that magically stops at the end, or similar laser output, that can be swung around like the movie props from Star Wars made back in the 70's from camera flash units used with film cameras originally.
There are some plasma cutters and laser welder tools that sorta look like light saber output, but they have a thick cable from the handle hooked up to a large power intensive machine that makes the core actions or energetic function happen, using a mix of gases like high pressure argon, and high voltage cables, to send the energy to the cutter or welder end, or fiber optics or similar. The problem with making a practical usable light saber comes down to a problem with realistic energy densities of known systems or devices that are handheld. I am thinking of blinding bright LED flashlights with tens of thousands of lumens, but thats not going to cut anything, though it can set fire to flammable materials if the beam tightens down to less than 2 deg divergence using projector optics.
You might be a movie nerd or geek interesting in a sound and light toy that works like the movie prop, but your taking about a plastic polycarbonate tube with cellophane light diffuser inside that takes the optical power from a 1w blight LED and similar lower output blinker strobe led of lower power, and uses a sound & light board with electronics to take battery energy from an 18650 or some LR6 AA's to make the light from the LED diffuse down the length of the plastic tube to produce an optical effect glowing rod like an fluorescent light T12 bulb, thats strong enough to hit things with, since its made of polycarbonate epoxy bonded to the nested aluminum tube handle decorated with o-rings & wiper blade rubber to look like the original movie prop versions.
Light Sabers are a fictional technology because battery energy density of even gasoline only 12,000 watt hours per kilogram, white the best single use or primary battery energy density comes from Lithium Thionyl Chloride cells with 6,000 Wh/kg or about half the energy density of gasoline, rechargeable batteries of the highest energy density type like Lithium Sulfur are about 1200 Wh/kg, while the best aerospace lithium-ion cells get to 650 Wh/kg, the more common kinds are more like 260 Wh/kg, while alkaline AA or LR6 similar at about 297 Wh/kg, the Energizer Lithium Iron Disulfide AA or LR6 have about 600 Wh/kg and are lower mass or lighter weigh.
To make 100cm plasma blade using magnetic fields and high voltage, the handle battery or handheld generator would need an energy source with millions of watt hours per kilogram, like nuclear fusion or really compact nuclear fission reactors that can fit into a handhold able tube handle, obviously not a feasible, realistic, or practical technology, not even for national states for military use.
If you look at the best directed energy weapons that nation states have, directed energy lasers, using diode pumped solid state the most energy efficient type, your talking about a truck mounted 100kW laser than needs a 1MW power system, something that nuclear powered aircraft carriers have or similar. The airborne laser was a commercial airplane with a chemical gas laser, oxygen iodine type, that took up the entire inside of the aircraft cabin, and was discontinues as a $6 billion project as it was deemed impractical even for America to have as a defense weapon against ICBM's or similar.
Referencing this YouTube Video
https://youtu.be/3es9O-IDNmE?si=P05Ka4aN4LZ6e7Fw
And this one
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