Grasers based on particle accelerators and on lasers
  Grasers based on a stimulated emission of gravitational radiation by relativistic charged particle beams in external fields and on a conversion of laser radiation into gravitational one in the magnetic fields as well as detectors are discussed. A scheme of the gravitational radiation not accompanied by an useless inaccessible by a value average power of the electromagnetic radiation and a stimulation of the conversion of gravitons into photons in gravitational detectors by an open resonator are considered. 
E.G.Bessonov (P.N.Lebedev Physical Institute AS, Moscow, Russia)