微下拉法生长Tb3AlxGa5-xO12磁光晶体及其性能表征

Tb₃Ga₅O₁₂晶体是一种具有良好磁光性能的主流商用材料，但生长过程中存在严重的氧化镓挥发问题，导致晶体难以满足高功率应用的发展需求，而菲尔德常数较大的Tb₃Al₅O₁₂晶体的不一致熔融特性使该晶体难以生长，因此亟需探索新型高质量磁光晶体以满足高功率应用需求。基于此，本文采用微下拉法在高纯氩气和二氧化碳混合气氛下生长了Tb₃Al_xGa_5-xO₁₂(TAGG)系列高掺铝磁光晶体。摇摆曲线测试结果表明TAGG磁光晶体拥有高结晶质量。透过光谱和磁光特性测试结果表明，与传统Tb₃Ga₅O₁₂晶体相比，TAGG磁光晶体具有更高的透过率和更大的菲尔德常数，是一种非常有潜力的可应用于高功率激光系统的低成本磁光材料。

Preparation and Properties of Tb3AlxGa5-xO12 Magneto-Optical Crystal by Micro-Pulling-Down Method

Tb₃Ga₅O₁₂ crystal is a mainstream commercial material with good magneto-optical performance, but it suffers from serious gallium oxide volatilization during the growth process, which makes it difficult to meet developing requirements in high power applications. Tb₃Al₅O₁₂ crystal, which shows a large Verdet constant, is difficult to grow due to its incongruent melting nature. Therefore, it is urgent to explore new high-quality magneto-optical crystals to meet the needs in high power applications. In this work, a series of Tb₃Al_xGa_5-xO₁₂ (TAGG) magneto-optical crystals with high aluminum content were grown by the micro-pulling-down method in a mixed atmosphere of high-purity nitrogen and carbon dioxide. The result of the rocking curve shows the as-grown TAGG magneto-optical crystal has high crystal quality. The transmittance spectrum and magneto-optical characteristics test results show that, the TAGG crystal shows a higher transparency and a larger Verdet constant compared with the traditional Tb₃Ga₅O₁₂ crystal, which is a very promising low-cost magneto-optical material for high power laser systems.