Special Edition LaserFest Photon Plush Toy
These massless "quanta of light" come in three colors, red, green, and blue. Each photon color represents the wavelength of light produced by a specific type of laser. The first working laser used a synthetic ruby to produce red laser light at 624 nanometers wavelength. The Helium-Cadmium laser produces blue laser light at 442 nanometers wavelength, while the Copper vapor laser produces green laser light at 511 nanometers wavelength.