Abstract: Crystal fibers combine the excellent optical properties of crystalline materials with the compactness advantage of fiber structure， making them a research hotspot in high-power and ultrafast laser fields. In this work， Nd∶LuScO₃ crystal fibers with different doping concentrations were successfully grown by the laser-heated pedestal growth method. The crystal structure was characterized by X-ray diffraction （XRD）， and the spectroscopic properties， including absorption/emission cross sections， fluorescence lifetimes， and Judd-Ofelt （J-O） analysis were systematically investigated. The effect of doping concentration on fluorescence lifetime was also examined. XRD confirms that the as-grown Nd∶LuScO₃ crystal fibers possess a cubic crystal system without any impurity phases. From the absorption spectrum， the absorption cross section at 807 nm is calculated to be 1.16×10^-20 cm2， with a full width at half-maximum of 10.63 nm. The J-O intensity parameters are Ω₂=0.67×10^-20 cm2， Ω₄=2.59×10^-20 cm2， and Ω₆=0.85×10^-20 cm2. The emission cross sections for the ⁴F_3/2→⁴I_9/2， ⁴I_11/2， ⁴I_13/2 transitions are 0.99×10^-20， 2.06×10^-20， and 0.41×10^-20 cm2， respectively. These results indicate that Nd∶LuScO₃ crystal fiber is a promising gain medium for achieving ultrafast laser output in the near-infrared wavelength range.

Key words: Nd∶LuScO₃; crystal fiber; laser-heated pedestal growth method; crystal growth; spectroscopic property