Last month we had the pleasure of bringing you [FireMyLaser’s] green laser spirograph. Just green is great for a while, but why not add red and blue for a full spectrum of color! [c4r0] steps in ...

Using a green laser beam, a ruby crystal, and blue light illumination, they demonstrated that light, under specific conditions, could block another light source, creating a visible shadow.

To do this, the researchers directed a high-power green laser through a cube made of standard ruby crystal and illuminated it with a blue laser from the side. When the green laser enters the ruby ...