Sound Amplification by Stimulated Emission of Radiation (SASER) is a process that is analogous to the operation of a laser, but instead of light, it amplifies sound waves. The concept of SASER is based on the principle of stimulated emission, which is the fundamental principle behind laser technology. In a SASER, a medium (often a crystal or a gas) is energized to create a population inversion, where more particles are in an excited state than in the lower energy state.
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