[Jay] hacked a Blu-Ray laser diode into a keychain enclosure. He found a heavy brass keychain light from Lowe’s and stuffed the diode and a larger battery inside. The existing batteries weren ...

This laser display is persistent thanks to a glow-in-the-dark screen. [Daniel] built it using a Blu-ray laser diode. As the laser dot traverses the screen, it charges the phosphors in the glow ...

Related: Why you shouldn’t throw out those DVDs and Blu-rays] Blu-ray discs are read using a 405 nanometer laser diode that, while often referred to as “blue,” technically falls in a shorter ...