In the 1930s, Nikola Tesla claimed to have theorized a “death beam,” which he said was an “apparatus [that] projects particles which may be relatively large or of microscopic dimensions, enabling us ...
A lot of the DIY laser engravers and cutters we cover here on Hackaday are made with laser diodes salvaged from Blu-ray drives and projectors, which are visible lasers in the 400 – 450nm range ...
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