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",
I Changed a Lot of HipHopDX said, ""I Changed A Lot" lacks a “We Taking Over”-style smash single to show for the incredible hit-making power of the performers present. Something just feels off in Khaled's traditional manner of creating ubiquitous pop cultural touchstones. This album is generally solid, but in lacking the groundbreaking moment we’ve come to expect from the artist/producer/chicken wing restaurateur known for being “the best,” it falls short." The album debuted at number 12 on the "Billboard" 200, with 25,000 equivalent album units in the United States, with 19,000 copies sold in its first week. I Changed a Lot I Changed