Abstract
Abstract : The generation, propagation and interaction of phonons with emphasis on the phonon interaction in crystals were investigated. Several phonon phonon interaction processes in X-cut quartz, silicon and germanium were investigated. These involve forward traveling wave, backward traveling wave, frequency up conversion and harmonic generation studies. Considerable analytical and experimental work was done on the generation, detection, propagation and interaction of phonons. Theoretical curves based on the selection rules were drawn for the various modes of operation for phonon phonon interaction in solids. Experimental results and observations are discussed pertaining to phonon generation and attenuation in various types of single crystals. Field enhancement techniques of microwave cavities for better microwave phonon generation were utilized. Piezoelectric and magnetostrictive transducers and their characteristic behavior were analyzed. Geoetries of the microwave structures are discussed. Calculations were made for studying the feasibility of amplifying phonons in ruby by means of optically pumped phonon maser inter actions. Tests were made on GaAs involving electron phonon interaction at 1.1 kmc.
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