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 looks like a fun, quick little project to try sometime. We wonder if the method can be refined to create the guts of a ruby laser, or if perhaps it can be used to create sapphires instead.

To create this effect, the team directed a high-power green laser through a ruby crystal and illuminated it perpendicularly with a blue laser. When the green laser interacted with the ruby ...

Each lesion was treated initially with the Q-switched ruby laser. Lesions that did not clear completely were retreated at 1 month (and, if necessary, at 2 months) with a Q-switched or normal-mode ...