TSAG晶体的生长及性能研究OA

Terbium scandium aluminum garnet(Tb3Sc2Al3O12,TSAG)crystal is a novel magneto-optic crystal with outstanding magneto-optical properties,which holds great promise for wide applications in high-power lasers.However,the high stress and susceptibility of TSAG crystal to cracking restrict the processing and practical utilization of corresponding optical components.To improve the crystal quality,this paper focused on the high stress problem in TSAG crystal and systematically investigated the composition distribution along the crystal growth direction and radial direction.By optimizing the crystal growth process,the composition uniformity of TSAG crystal was effectively enhanced,and φ45 mm×100 mm low-stress TSAG crystal was successfully grown.The fabricated TSAG crystal component exhibits an absorption loss coefficient of 0.19％/cm,and the developed isolator with a 3 mm clear aperture achieves a minimum isolation of 36.19 dB.The magneto-optical properties of TSAG crystals in different directions are further studied in detail.The crystal in the[100]direction possesses the maximum Verdet constant(51.38 rad·m-1·T-1),which is beneficial for the miniaturization of isolators.The research results demonstrate that the successful development of low-stress TSAG crystal is expected to realize the application of TSAG crystal in high-power laser system.