Abstract:

The Raman mapping test of lithium tantalate crystal was studied by laser raman microscopy spectrometer.The com-position distribution of lithium tantalate crystal was imaged by Raman mapping in the characteristic peak intensity of 865 cm^-1.The Li content distribution of crystal was imaged by Raman mapping in the characteristic peak FWHM of 865 cm^-1.The de-fects distribution of crystal was imaged by Raman mapping in the defects peak intensity of 750 cm^-1.The stress distribution of crystal was imaged by Raman mapping in the characteristic peak position of 865 cm^-1.The test results showed the composi-tion,defects and stress distribution of lithium tantalate single crystal sheet could be well imaged by Raman mapping.The composition and Li content distribution of undoped lithium tantalate crystal were more uniform than that doped with Fe₂O₃.The distribution of intrinsic defects in undoped and doped lithium tantalate crystals with Fe₂O₃ was both relatively uniform and few.The stress distribution of undoped lithium tantalate crystal was more uniform than that doped with Fe₂O₃.There was an obvious stress concentration region in lithium tantalate crystal doped with Fe₂O₃.

Key words: Raman mapping, lithium tantalate, composition distribution, defects distribution, stress distribution