Q-switching in these devices causes a phenomenon in which the number of particles in an excited state exceeds the number in a lower energy state, called population inversion.
One of these devices uses the neodymium ion to dope a YAG host crystal. Optical tweezers operate from the force created by these devices, which were used to cool rubidium-87 atoms in the creation of the first Bose-Einstein condensate. Q-switching in these devices causes a phenomenon in which the number of particles in an excited state exceeds the number in a lower energy state, called population inversion. The gain medium of these devices provides energy during pumping, and the optical cavity consists of a pair of mirrors that allows the escape of photons. For 10 points, name these devices that make light coherent through stimulated emission of radiation.
One of these devices uses the neodymium ion to dope a YAG host crystal.
lasers [or light amplification by stimulated emission of radiation before "amplify"]