Fig. 1. Schematic diagram of Faraday effect. (a) Energy-level splitting of ground state; (b) Energy-level splitting of excited state;(c) Different transition probabilities caused by left-handed and right-handed light^[3]

Fig. 2. Working principle of magneto-optical isolator^[3]

Fig. 3. Verdet constant value of different rare earth elements^[26]

Fig. 4. The optical elements fabricated from grown TbF₃ crystals ^[31]

Fig. 5. PrF₃ crystal grown by Czochralski technique^[33]

Fig. 6. PrF₃ crystal grown by temperature gradient technique^[35]

Fig. 7. Two magneto-optic crystal optical isolators based on CeF₃^[42]

Fig. 8. LiREF₄ single crystals, from left to right: LiTbF₄, LiDyF₄, LiHoF₄, LiErF₄, and LiYbF₄^[34]

Fig. 9. KTb₃F₁₀ crystal processing samples^[54]

Fig. 10. Na_0.37Tb_0.63F_2.26 crystal^[59]

Fig. 11. Comparison of transmission spectra of several fluoride magneto-optic materials