Sound amplification by stimulated emission of radiation the axes of the mirrors, it is possible for photons to repeat multiple reflections and force more and more photons to follow them producing an avalanche effect. The number of photons of this coherent laser beam increases and competes the number of photons perished due to losses. The basic necessary condition for the generation of a laser radiation is the population inversion, which can be achieved either by exciting atoms and inducing percussion or by external radiation absorption. A SASER device mimics this procedure using a source-pump to induce a sound beam of phonons. This sound beam propagates not in
A Moving Sound of the human condition." A Moving Sound has attracted international attention for opening doors to the under explored territory of Far Eastern music. The group is intensely passionate about how it presents the use of traditional instruments in its contemporary sound. Their approach is to be holistic – combining art, spirituality, social awareness, and a universal love of humanity play key roles in the creative process. According to Tom Pryor, music supervisor for National Geographic, "A Moving Sound is one of the most original outfits working in the world music arena today, an inspired marriage of Taiwanese traditional sounds and