A novel disordered structure crystal has drawn intense interest as a promising ultrafast laser crystal host for its broad absorption and emission bands. Herein, a novel disordered crystal of Nd³⁺-doped CaYAl₃O₇ (CYAM) was successfully grown using the Czochralski method for the first time. The effective segregation coefficient of Nd³⁺ ions in CaYAl₃O₇ was calculated to be 0.76. To better understand the intrinsic optical properties, the transmission spectra and refractive index of pure CaYAl₃O₇ were measured. A systematic investigation of the crystal structure characteristics, fluorescence lifetime, and polarized absorption and emission cross-sections of the Nd:CYAM crystal at RT was reported. The maximal absorption cross-sections are 3.51 and 5.34 × 10⁻²⁰ cm² for π-polarization and σ-polarization, with a FWHM of 18 nm. The emission cross-sections of π- and σ-polarization are 5.97 and 4.55 × 10⁻²⁰ cm² with FWHM values of 14 and 14.4 nm, respectively. The results show that the Nd:CYAM crystal has broad, strong absorption and emission cross-sections. In particular, effective continuous-wave laser operation was realized with this crystal in the a-cut sample for the first time. A maximum output power of 714 mW was achieved, corresponding to an optical-to-optical conversion efficiency of 7.14% and a slope efficiency of 8.6%. Collectively, these results show that the Nd:CaYAl₃O₇ crystal is a promising disordered laser host.

中文翻译：

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掺钕CaYAl3O7：新型无序激光晶体的探索和激光性能

新型的无序结构晶体因其宽的吸收和发射谱带而成为有前途的超快激光晶体宿主，引起了广泛的关注。本文中，首次使用切克劳斯基方法成功地生长了一种新型的Nd ³⁺掺杂的CaYAl ₃ O ₇（CYAM）无序晶体。Nd ³⁺离子在CaYAl ₃ O ₇中的有效偏析系数经计算为0.76。为了更好地了解纯CaYAl ₃ O ₇的固有光学性质，透射光谱和折射率被测量。对RT下Nd：CYAM晶体的晶体结构特征，荧光寿命以及极化吸收和发射截面进行了系统研究。π极化和σ极化的最大吸收截面为3.51和5.34×10 ^-20 cm ²，FWHM为18 nm。π极化和σ极化的发射截面分别为5.97和4.55×10 ^-20 cm ²，FWHM值分别为14和14.4 nm。结果表明，Nd：CYAM晶体具有宽，强的吸收和发射截面。特别地，有效的连续波激光器的操作用该晶体中实现一个第一次切割样品。实现了714 mW的最大输出功率，对应于7.14％的光-光转换效率和8.6％的斜率效率。总而言之，这些结果表明，Nd：CaYAl ₃ O ₇晶体是一种有前途的无序激光宿主。