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The generation of High-Frequency Gravitational Waves (HFGW) has beenidentified as the required breakthrough that will lead to new forms of spacepropulsion. Many techniques have been devised to generate HFGW, but most ofthem exhibit marginal efficiency, therefore the power emitted in form ofgravitational waves (GW) is orders of magnitude lower than the input power. Thegravitational wave counterpart of the LASER, termed Gravitational-wave LASER or"GASER" is the quantum approach to the efficient generation of gravitationalwaves. Electrons, protons, muons, etc, all have charge and mass, if acceleratedthey usually lose energy through the very fast electric and magnetic channels,this causes a negligible emission through the gravitational channel. Quantumsystems can be engineered to forbid electric and magnetic transitions,therefore the gravitational spin-2 transitions can take place. A class ofactive materials, suitable for making a GASER based on electronic transitionsin the solid state, is identified along with their relevant physicalproperties. Means for creating coherence and population inversion and means toincrease the emission probability are described. The expected performances ofthe device are derived from quantum gravitational theories. Additionalproperties of the active materials are considered to enforce the theoreticalfoundation of the device. A proof-of-concept device, operating at about 1 THz,is described. Experiments are proposed as a natural starting point of theresearch.Comment: CP699, Space Technology and Applications International Forum-STAIF  2004, proceedings published by AIP and edited by M.S. El-Gen

Design of a Quantum Source of High-Frequency Gravitational Waves (HFGW) and Test Methodology