Sound amplification by stimulated emission of radiation of the laser. In a SASER device, a source (e.g., an electric field as a pump) produces sound waves (lattice vibrations, phonons) that travel through an active medium. In this active medium, a stimulated emission of phonons leads to amplification of the sound waves, resulting in a sound beam coming out of the device. The sound wave beams emitted from such devices are highly coherent. The first successful SASERs were developed in 2009. Instead of a feedback-built wave of electromagnetic radiation (i.e., a laser beam), a SASER delivers a sound wave. SASER may also be referred to as "phonon laser",
A Tale of a Tub in the reception of Swift's work is that the narrator of the work is an extremist in every direction. Consequently, he can no more construct a sound allegory than he can finish his digressions without losing control (eventually confessing that he is insane). For a Church of England reader, the allegory of the brothers provides small comfort. Martin has a corrupted faith, one full of holes and still with ornaments on it. His only virtue is that he avoids the excesses of his brothers, but the original faith is lost to him. Readers of the "Tale" have picked up on