Growth and Properties of Nd∶TSAG Crystal

Abstract

Abstract: 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 Ω_t, transition probability between ⁴F_3/2→⁴I_J 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.

Key words: Nd:TSAG, magneto-optical crystal, crystal growth, spectral analysis, magneto-optical property, thermal conductivity

CLC Number:

DOU Renqin, HUANG Lei, WANG Xiaofei, GAO Jinyun, LIU Wenpeng, LUO Jianqiao, ZHANG Qingli. Growth and Properties of Nd∶TSAG Crystal[J]. Journal of Synthetic Crystals, 2024, 53(11): 1936-1943.

References

[1] YASUHARA R, SNETKOV I, STAROBOR A, et al. Faraday rotator based on TSAG crystal with orientation[J]. Optics Express, 2016, 24(14): 15486.
[2] STAROBOR A, YASYHARA R, SNETKOV I, et al. TSAG-based cryogenic Faraday isolator[J]. Optical Materials, 2015, 47: 112-117.
[3] SNETKOV I, PALASHOV O. Faraday isolator based on a TSAG single crystal with compensation of thermally induced depolarization inside magnetic field[J]. Optical Materials, 2015, 42: 293-297.
[4] GOTO T, MORIMOTO R, PRITCHARD J W, et al. Magneto-optical Q-switching using magnetic garnet film with micromagnetic domains[J]. Optics Express, 2016, 24(16): 17635-17643.
[5] BRANDLE C D, BARNS R L. Crystal stoichiometry and growth of rare-earth garnets containing scandium[J]. Journal of Crystal Growth, 1973, 20(1): 1-5.
[6] YOSHIKAWA A, KAGAMITANI Y, PAWLAK D A, et al. Czochralski growth of Tb₃Sc₂Al₃O₁₂ single crystal for Faraday rotator[J]. Materials Research Bulletin, 2002, 37(1): 1-10.
[7] SNETKOV I L, YASUHARA R, STAROBOR A V, et al. Thermo-optical and magneto-optical characteristics of terbium scandium aluminum garnet crystals[J]. IEEE Journal of Quantum Electronics, 2015, 51(7): 7000307.
[8] LI L C, YU Y X, ZHANG S, et al. Eliminate of cracking for the growth of large-size Tb₃Sc₂Al₃O₁₂ crystals[J]. Journal of Crystal Growth, 2022, 579: 126458.
[9] 郝元凯, 辛显辉, 刘蕾, 等. 高质量Tb₃Sc₂Al₃O₁₂磁光晶体的生长及性能[J]. 发光学报, 2022, 43(7): 1070-1077.
HAO Y K, XIN X H, LIU L, et al. Growth and characterization of Tb₃Sc₂Al₃O₁₂ magneto-optical crystal[J]. Chinese Journal of Luminescence, 2022, 43(7): 1070-1077 (in Chinese).
[10] SHIMAMURA K, KITO T, CASTEL E, et al. Growth of{Tb₃}[Sc_2-xLu_x](Al₃)O₁₂ single crystals for visible-infrared optical isolators[J]. Crystal Growth & Design, 2010, 10(8): 3466-3470.
[11] VÍLLORA E G, MOLINA P, NAKAMURA M, et al. Faraday rotator properties of{Tb₃}[Sc_1.95Lu_0.05](Al₃)O₁₂, a highly transparent terbium-garnet for visible-infrared optical isolators[J]. 2011, 99(1): 011111.
[12] 张榕贵, 陈腾波, 李来超, 等. Dy、Lu掺杂对TSAG晶体磁光特性影响研究[J]. 人工晶体学报, 2023, 52(8): 1407-1412.
ZHANG R G, CHEN T B, LI L H, et al. Effect of Dy and Lu doping on magneto-optical properties of TSAG crystal[J]. Journal of synthetic crystals, 2023, 52(8): 1407-1412 (in Chinese).
[13] HAO Y K, XIN X H, YANG X X, et al. Reporting a novel visible near-infrared{Tb₃}[Ga_0.1Sc_1.9](Al₃)O₁₂ single crystal for Faraday isolators[J]. Journal of Materials Chemistry C, 2023, 11(28): 9727-9734.
[14] YANAGIDA T, OKADA G, KOJIMA T, et al. Scintillation properties of TGG and TSAG crystals for imaging applications[J]. Physica B: Condensed Matter, 2017, 518: 51-55.
[15] CHEN Z, YANG L, HANG Y, et al. Improving characteristic of Faraday effect based on the Tm³⁺ doped terbium gallium garnet single crystal[J]. Journal of Alloys and Compounds, 2016, 661: 62-65.
[16] CHEN Z, HANG Y, WANG X Y, et al. Fabrication and characterization of TGG crystals containing paramagnetic rare-earth ions[J]. Solid State Communications, 2016, 241: 38-42.
[17] CHEN Z, YANG L, HANG Y, et al. Faraday effect improvement by Dy³⁺-doping of terbium gallium garnet single crystal[J]. Journal of Solid State Chemistry, 2016, 233: 277-281.
[18] HAO Y K, FU X W, XIN X H, et al. Growth and magneto-optical properties of Ho-doped Tb₃Sc₂Al₃O₁₂ single crystal for faraday isolators[J]. Optical Materials, 2024, 149: 115001.
[19] 窦仁勤, 刘耀, 罗建乔, 等. Nd∶GdYAG激光晶体的光谱分析及热学性能研究[J]. 人工晶体学报, 2024, 53(9): 1504-1511.
DOU R Q, LIU Y, LUO J Q, et al. Spectral analysis and thermal properties of Nd∶GdYAG laser crystal[J]. Journal of Synthetic Crystals, 2024, 53(9): 1504-1511 (in Chinese).
[20] DOU R Q, ZHANG H T, ZHANG Q L, et al. Growth and properties of TSAG and TSLAG magneto-optical crystals with large size[J]. Optical Materials, 2019, 96: 109272.
[21] GUO F Y, CHEN X, GONG Z L, et al. Growth and Faraday rotation characteristics of TbVO₄ crystals[J]. Optical Materials, 2015, 47: 543-547.
[22] POPOV P A, IVANOV I A, KARIMOV D N. Investigation of the thermal conductivity terbium gallium and terbium scandium aluminum garnet crystals[J]. Crystallography Reports, 2018, 63(3): 451-455.