X ray topography study of gallium phosphate crystals and resonators

Using the synchrotron radiation delivered by the DCI storage ring at LURE (Orsay, France), the X-ray topography technique was used to study the crystalline perfection of GaPO₄ samples grown under different conditions. The growth of gallium phosphate on a berlinite seed is analyzed by X-ray section topography. The results obtained demonstrate the feasibility of gallium phosphate epitaxy on large berlinite seeds in a sulphuric acid medium. These first characterizations indicate the good quality of gallium phosphate epitaxy on berlinite seeds. This method is a good solution for obtaining gallium phosphate crystals of good quality and large sizes. Different vibration modes of approximately rhombohedral face cut and near AT cut thickness shear resonators were observed