“Reporting on the latest advancements in laser crystal material research, Lutetium oxide (Lu2O3), known for its high thermal conductivity, low phonon energy, and strong crystal field, has been studied for its potential as a laser crystal material. Despite its high melting point of 2,450°C, which leads to significant temperature gradients and defect proliferation, a comprehensive understanding of its defects has been lacking. This study, using the chemical etching method, has identified optimal conditions for examining dislocation defects in Lu2O3 crystals, providing solutions to enhance crystal quality and optimize the crystal growth process. Expert research in the field of laser crystal materials has verified the optimal etching conditions for Lu2O3, laying a foundation for improving crystal quality.”