Investigation of thermal induced depolarization in high-power Faraday isolator and its compensation design
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摘要: 针对磁光晶体在大功率光隔离器中的应用，结合实际光学元件参数，利用琼斯矩阵分析了隔离度与入射光功率间的关系。提出基于外置材料，对磁光晶体热致退偏效应的补偿方案：针对两种不同的常见补偿材料，给出了它们的设计参数，并对两种材料的补偿效果进行对比。结果表明，在50 W的光功率下，利用CaF2晶体和SiO2，可分别提高隔离度约15 dB和4 dB。Abstract: For the use of the magneto-optic crystal in a high-power optical isolator, the relationship between the isolation and the incident light power is analyzed with Jones matrix using the parameters of actual optical elements. A compensation scheme for thermal induced depolarization in magneto-optic crystal is proposed, which is based on external material. The design method of the compensation scheme for two different materials is given. The result shows that at the power of 50 W, by using CaF2 crystal and SiO2, the isolation can be increased by 15 dB and 4 dB respectively.
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Key words:
- Faraday effect /
- isolator /
- high-power /
- thermal depolarization /
- thermal compensation
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