Resolved hyperfine structure and narrow inhomogeneously broadened lines in the optical spectra of a rare-earth-doped crystal are favorable for the implementation of various sensors. Here, a well-resolved hyperfine structure in the photoluminescence spectra of LiYF₄:Ho single crystals and the anticrossings of hyperfine levels in a magnetic field are demonstrated using a self-made setup based on a Bruker 125HR high-resolution Fourier spectrometer. This is the first observation of the resolved hyperfine structure and anticrossing hyperfine levels in the luminescence spectra of a crystal. The narrowest spectral linewidth is only 0.0022 cm⁻¹. This fact together with a large value of the magnetic g factor of several crystal-field states creates prerequisites for developing magnetic field sensors, which can be in demand in modern quantum information technology devices operating at low temperatures. Very small random lattice strains characterizing the quality of a crystal can be detected using anticrossing points.

稀土掺杂晶体的光谱中分辨出的超精细结构和狭窄的不均匀展宽线有利于各种传感器的实现。在这里，使用基于 Bruker 125HR 高分辨率傅里叶光谱仪的自制装置展示了LiYF ₄ :Ho 单晶的光致发光光谱中的良好分辨的超精细结构和磁场中超精细能级的反交叉。这是对晶体发光光谱中已分辨的超精细结构和反交叉超精细能级的首次观察。最窄的光谱线宽仅为0.0022 cm ^-1。这一事实与磁g的大值一起几个晶体场状态的因素为开发磁场传感器创造了先决条件，在低温下运行的现代量子信息技术设备中可能需要这种传感器。可以使用反交叉点检测表征晶体质量的非常小的随机晶格应变。