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Nd∶TSAG晶体的生长及性能研究

Growth and Properties of Nd∶TSAG Crystal

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【作者】 窦仁勤黄磊王小飞高进云刘文鹏罗建乔张庆礼

【Author】 DOU Renqin;HUANG Lei;WANG Xiaofei;GAO Jinyun;LIU Wenpeng;LUO Jianqiao;ZHANG Qingli;Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science, Chinese Academy of Sciences;Advanced Laser Technology Laboratory of Anhui Province;University of Science and Technology of China;

【通讯作者】 张庆礼;

【机构】 中国科学院合肥物质科学研究院,安徽光学精密机械研究所,光子器件与材料安徽省重点实验室先进激光技术安徽省实验室中国科学技术大学

【摘要】 本文采用提拉法首次生长了晶体尺寸为?50 mm×100 mm的Nd∶TSAG磁光晶体,对其结构、光谱、磁光及热学性能进行了研究,并对振子强度和线强、强度参数Ωt4F3/24IJ能级间的跃迁概率、能级辐射寿命、荧光分支比等光谱参数进行了计算。对Nd∶TSAG多晶样品掺杂浓度进行了优化,Nd3+的最佳掺杂浓度(原子数分数)为1%。晶体及粉末X射线衍射分析结果表明,晶体为纯相且结晶质量较好,Nd3+在TSAG晶体中的分凝系数为0.64。Nd∶TSAG晶体在可见和近红外波段,除了Tb3+和Nd3+的特征吸收,透过率达到80%以上。在808 nm激发下,Nd∶TSAG的最强荧光峰在1 070 nm附近。Nd∶TSAG晶体在473、532、632.8、1 064 nm波长处的折射率分别为1.925 9、1.915 3、1.903 8和1.885 2,拟合了四参数Sellmeier折射率方程。采用消光法测试了Nd∶TSAG晶体在405、532、635、1 064 nm波长处的Verdet常数分别为599.8、202.8、152.3、46.8 rad·m-1·T-1。室温下,Nd∶TSAG晶体的热导率为3.95 W/(m·K)。研究结果表明,Nd∶TSAG是优异的磁光晶体,也是潜在的优异激光晶体,有望同时实现磁光和激光的功能。

【Abstract】 Nd∶TSAG magneto-optical crystal with the size of ?50 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 Ωt, transition probability between 4F3/24IJ 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.

【基金】 国家重点研发计划(2023YFB3507401,2023YFB3507403,2022YFB3605700);国家自然科学基金(52272011,51802307);中国科学院青年创新促进会(2023463)
  • 【文献出处】 人工晶体学报 ,Journal of Synthetic Crystals , 编辑部邮箱 ,2024年11期
  • 【分类号】O782.5
  • 【下载频次】42
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