Here’s a whirlwind tour of some of my favorites. On that list are a POV holographic display, giant cast-resin LEDs, an optical-pump ruby laser built out of parts from AliExpress, blinky goodness ...

This is contrary to our experience. Using a ruby laser operating in relaxation oscillations with an output of only 0.2 joule and a beam divergence of 3 milliradians, we can produce a hole with two ...

AN essential feature in the recording of holograms is the diversion of part of the illumination as a coherent reference wave, which can be reproduced subsequently for reconstructing the wavefront ...

The light-shadow experiment began when physicists led by Raphael Akel Abrahao sent a high-power beam of green laser light through a cube-shaped ruby crystal. They then illuminated this beam from the ...