Sound amplification by stimulated emission of radiation of a coherent amplification of THz sound. The THz stimulated phonon induced transitions between the electron superlattice states lead to this coherent amplification while processing a population inversion. An essential step towards coherent generation ("sasing") of THz sound and other active hypersound devices has been provided by this achievement of THz sound amplification. Generally, in a device where the threshold for "sasing" is achieved, the technique described by this proposed scheme could be used to measure the coherence time of the emitted hypersound. Sound amplification by stimulated emission of radiation Sound amplification by stimulated emission of radiation (SASER) refers to
A Sense of Direction A Sense of Direction A Sense of Direction is an album led by vibraphonist and composer Walt Dickerson recorded in 1961 and released on the New Jazz label. AllMusic awarded the album 4½ stars with its review by Steve Huey stating, "If it's a shade less challenging and inventive than "This Is Walt Dickerson!", "A Sense of Direction" compensates by making Dickerson's innovations more accessible and inviting". Down Beat reviewer Pete Welding wrote "if it is only slightly less adventurous than his initial recording, it is still an ardent collection -- primarily of ballads -- treated with unflagging invention and