There may never be a lightsaber in our lifetime, but let's just keep holding out for it. But assuming you can't wait, this is the closest you'll get: a lightsaber and a katana mashup made by Man At Arms: Reforged.

It is mostly a katana with a ligthsaber handle.

The preparation for it was detailed and intricate.

It's exactly what a Jedi would use if he had no choice.

All you have to do is imagine it glows.

Here it is in the hands of ninja Darth Vader.

Check out how it was made: