This crystal can split light particles

Green lasers blew my mind since I first read how green light is generated from invisible ir light with a help of a crystal. Later, when I heard about the delayed choice quantum eraser experiment, it blew again, as I read how they generate their entangled photons...with "a green laser pointer". These everyday things like green laser pointers use quantum physics to generate green light from invisible and furthermore the output are entangled photons, theoretically. I now feel like holding a light saber when doing my presentations :D