Langasite crystal quality improvement aimed at high-Q resonator fabrication

Processes of langasite crystal growth are considered. Heat assembly design, pulling and rotation rates are optimized. Composition of charge, impurity content and technology of its manufacture have been studied. Influence of annealing regimes on crystal quality are discussed. Design and technology investigations of langasite resonators for crystal material quality factor evaluation is reported. Langasite resonator at 5 MHz, 3rd overtone has been developed.