Its a 1/2" flat Optics Quality Cast Acrylic sheet cut and carved to shape. AKA. Ripper Blade. Top grade cast acrylic will only allow light to exit where the surface is disrupted or there is an impurity in resin. Photograph it in a dark room with a black satin cloth as the background and you get this effect. Since it is acrylic, it is a show blade only. you can get it in PC but the light piping will not be as good. In real world lighting the center will show slight lighting, but it will give a convincing effect. Figure out a rectangular hilt and custom mount some CREE SMD dice on a rectangular board/heat-sink you could have a nice black saber show piece.
The one shown in the image is a raw ripper blade, minus the after purchase finishing mentioned in my earlier post. There are even better examples on Halo forum where people have used the same techniques for Energy Sword props.
Here is the larger image:
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