Millie micro nano pico Book 9 in which Millie goes inside a red laser beam

Millie micro nano pico Book 9 is about the basic principles of lasers. Millie watches how electrons and red photons cooperate to generate a laser beam. At first, she is intrigued by the process of optical pumping. Later, she realises its utility, when she understands the difference between light from a common bulb and light from a laser. In this adventure, Millie revisits the concept of absorption, emission and energy levels introduced in Book 3, but here she sees their practical application. Millie needs your help! Please, send all your questions to Millie's website milliemicronanopico.com/en/ or to her Facebook page www.facebook/milliemicronanopico. If Millie uses one of your questions in a new story, she will send you a certificate.