ACOUSTIC LASER WITH DISPERSED PARTICLES AS AN ANALOG OF A FREE-ELECTRON LASER

The theoretical scheme of an acoustic laser is suggested. A liquid dielectric with dispersed particles is considered as an active medium. Pumping is created by an oscillating electric field that deforms dispersed particle volumes. Phase bunching of initially incoherent emitters is realized by acoustic radiation forces. The time increment of the useful mode and the value of the starting pumping amplitude are calculated. The suggested scheme is analogous to the free-electron laser. © 1995 The American Physical Society.