Abstract For the first time, we investigated the crystal field dependent fine structure splitting in different crystal phases (pure tetragonal (T), pure hexahedral (H), (H + T) and (T + H)) of Eu3+:YPO4 crystals. We observed that each phase with its unique point group site symmetry results in unique fine structure splitting. The fine structure of T-phase and H-phase splits into two- and three-energy levels, respectively. By controlling temperature, the influence of dressing-phonon competition on the linewidth of spectral signal is also discussed. In T-phase Eu3+:YPO4, one spectral peak splits into three peaks under the action of stress and dressing field as temperature is reduced from 300 K to 77 K. The relationship between temporal and spectral intensity in different phases of Eu3+:YPO4 is also discussed. The Pr3+ ion has a stronger dressing than the Eu3+ ion in a host material of YPO4 which can be explained from higher dipole moment. To further explore this comparison, we investigated intensity-noise correlation under nonlinear phase controlled by time delay in both Eu3+:YPO4 and Pr3+:YPO4.

中文翻译：

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YPO4晶体相变诱导5D0→7F1掺杂Eu3+离子分裂

摘要 我们首次研究了Eu3+:YPO4 晶体在不同晶相（纯四方(T)、纯六面体(H)、(H + T) 和(T + H)）中的晶体场相关精细结构分裂。我们观察到每个相具有其独特的点群位点对称性，导致独特的精细结构分裂。T 相和 H 相的精细结构分别分为两能级和三能级。通过控制温度，还讨论了修整声子竞争对光谱信号线宽的影响。在 T 相 Eu3+:YPO4 中，随着温度从 300 K 降低到 77 K，在应力和修整场的作用下，一个光谱峰分裂成三个峰。 Eu3+:YPO4 不同相的时间和光谱强度之间的关系也是讨论。Pr3+ 离子比Eu3+ 离子在YPO4 主体材料中具有更强的敷料，这可以从更高的偶极矩来解释。为了进一步探索这种比较，我们研究了 Eu3+:YPO4 和 Pr3+:YPO4 中由时间延迟控制的非线性相位下的强度-噪声相关性。