Magneto-optical transparent ceramics exhibiting the Faraday effect provide new opportunities for optical isolator applications.In this study,magneto-optical transparent ceramics(Tb_(0.94−x)Lu_(0.06)Ho_(x))_(2)O_(3)(x=...Magneto-optical transparent ceramics exhibiting the Faraday effect provide new opportunities for optical isolator applications.In this study,magneto-optical transparent ceramics(Tb_(0.94−x)Lu_(0.06)Ho_(x))_(2)O_(3)(x=0,0.005,0.01,0.0125,and 0.015)were successfully fabricated by reducing atmosphere sintering and hot isostatic pressing(HIP)posttreatment.The effects of x on the microstructure,in-line transmittance,and magneto-optical properties were studied.The addition of Ho^(3+) promoted the densification of the ceramics,increasing their transmittance,with the in-line transmittance of(Tb_(0.93)Lu_(0.06)Ho_(0.01))_(2)O_(3)reaching 79.05%at 1064 nm.Importantly,the Verdet constant was influenced by the doping of Ho3+.The highest Verdet constant of(Tb_(0.925)Lu_(0.06)Ho_(0.015))2O3 was approximately−404 rad·T^(−1)·m^(−1),which was approximately 6%greater than that of the undoped sample and more than 3 times that of the terbium gallium garnet(TGG)crystal.展开更多
建立了全光纤电流互感器（fiber-optical current transformer,FOCT）温度特性的数学模型。该模型充分考虑传感光纤的弯曲特性,结合光纤线性双折射的分布参数模型从本质上解释了温度对线性双折射的影响机理：由于传感环的弯曲性,温度变...建立了全光纤电流互感器（fiber-optical current transformer,FOCT）温度特性的数学模型。该模型充分考虑传感光纤的弯曲特性,结合光纤线性双折射的分布参数模型从本质上解释了温度对线性双折射的影响机理：由于传感环的弯曲性,温度变化会导致光纤横截面上的受力不对称,进而引起线性双折射;单位长度光纤的线性双折射相位差与温度变化量成正比,与光纤弯曲半径成反比。并结合光纤Verdet常数的温度特性综合量化了温度对FOCT的影响。采用COMSOL有限元分析方法实现光场、磁场、温度场、应力场的耦合并分析求解。仿真结果表明：双折射效应会使光波旋转角变小;光纤横截面上的应力差与温度变化量成正比,与光纤弯曲半径成反比;温度波动将引起线性双折射,进而使光波旋转角减小;结合Verdet常数得到了温度波动时FOCT的综合误差,与理论分析结果吻合。最后设计并搭建FOCT实验平台,进行线性度测试和温度循环测试。测试结果表明：实验误差与理论误差变化趋势基本一致;温度波动越大,FOCT误差漂移越严重,必须采取补偿措施,故提出一系列改善FOCT温度稳定性的方法。仿真与实验结果验证了理论分析的正确性。展开更多
基金support from the National Key R&D Program of China(No.2023YFB3507400)the Dean Foundation of the China Academy of Engineering Physics,the Science and Technology Innovation Talent Fund of Sichuan Province(No.2023JDRC0015)the National Natural Science Foundation of China(No.52172121).
文摘Magneto-optical transparent ceramics exhibiting the Faraday effect provide new opportunities for optical isolator applications.In this study,magneto-optical transparent ceramics(Tb_(0.94−x)Lu_(0.06)Ho_(x))_(2)O_(3)(x=0,0.005,0.01,0.0125,and 0.015)were successfully fabricated by reducing atmosphere sintering and hot isostatic pressing(HIP)posttreatment.The effects of x on the microstructure,in-line transmittance,and magneto-optical properties were studied.The addition of Ho^(3+) promoted the densification of the ceramics,increasing their transmittance,with the in-line transmittance of(Tb_(0.93)Lu_(0.06)Ho_(0.01))_(2)O_(3)reaching 79.05%at 1064 nm.Importantly,the Verdet constant was influenced by the doping of Ho3+.The highest Verdet constant of(Tb_(0.925)Lu_(0.06)Ho_(0.015))2O3 was approximately−404 rad·T^(−1)·m^(−1),which was approximately 6%greater than that of the undoped sample and more than 3 times that of the terbium gallium garnet(TGG)crystal.
文摘建立了全光纤电流互感器（fiber-optical current transformer,FOCT）温度特性的数学模型。该模型充分考虑传感光纤的弯曲特性,结合光纤线性双折射的分布参数模型从本质上解释了温度对线性双折射的影响机理：由于传感环的弯曲性,温度变化会导致光纤横截面上的受力不对称,进而引起线性双折射;单位长度光纤的线性双折射相位差与温度变化量成正比,与光纤弯曲半径成反比。并结合光纤Verdet常数的温度特性综合量化了温度对FOCT的影响。采用COMSOL有限元分析方法实现光场、磁场、温度场、应力场的耦合并分析求解。仿真结果表明：双折射效应会使光波旋转角变小;光纤横截面上的应力差与温度变化量成正比,与光纤弯曲半径成反比;温度波动将引起线性双折射,进而使光波旋转角减小;结合Verdet常数得到了温度波动时FOCT的综合误差,与理论分析结果吻合。最后设计并搭建FOCT实验平台,进行线性度测试和温度循环测试。测试结果表明：实验误差与理论误差变化趋势基本一致;温度波动越大,FOCT误差漂移越严重,必须采取补偿措施,故提出一系列改善FOCT温度稳定性的方法。仿真与实验结果验证了理论分析的正确性。
