Nd∶TSAG magneto-optical crystal with the size of φ50 mm × 100 mm were grown by Czochralski method for the first time.The structure,spectra,magneto-optical,and thermal properties of the crystal were studied in detail.Spectral parameters,such as oscillator strength,line strength,intensity parameter℃t,transition probability between 4F3/2→4IJ energy levels,radiation lifetime,and fluorescence branching ratio were calculated.The doping concentration of Nd∶TSAG polycrystalline samples was optimized,and the best doping concentration of Nd3+(atomic fraction)is 1％.The results of X-ray diffraction analysis of crystal and powder show that the crystal has a pure phase and good crystal quality.The separation coefficient of Nd3+in TSAG crystal is 0.64.In the visible and near infrared bands,the transmittance of Nd∶TSAG crystals is over 80％,except for the characteristic absorption of Tb3+and Nd3+.With 808 nm excitation,the strongest fluorescence peak of Nd∶TSAG is around 1 070 nm.The refractive indices of Nd∶TSAG crystals at 473,532,632.8,and 1 064 nm are 1.925 9,1.915 3,1.903 8,and 1.885 2,respectively.The four-parameter Sellmeier refractive index equation is fitted.The Verdet constants of Nd∶TSAG measured by extinction method at 405,532,635,and 1 064 nm are 599.8,202.8,152.3,and 46.8 rad·m-1·T-1,respectively,which are higher than that of TGG crystals.At room temperature,the thermal conductivity of Nd∶TSAG crystals is 3.95 W/(m·K).The results show that Nd∶TSAG is an excellent magneto-optical crystal and a potential excellent laser crystal.Meanwhile,it is promising to realize the synergistic effect of magneto-optic and laser.
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