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
The Sound of a Voice The Sound of a Voice The Sound of a Voice is a 1983 play by American playwright David Henry Hwang. Hwang's fifth play, it is an original ghost story inspired by Japanese folk stories, films, and Noh theater. The play was first produced as part of the production "Sound and Beauty" on November 6, 1983 Off-Broadway at the Joseph Papp Public Theater. It was directed by and featured John Lone. Composer Philip Glass and Hwang adapted it for the opera "The Sound of a Voice" in 2003. That same year, Susan Hoffman directed a film adaptation entitled "Sound of a