Dual-line waveguides in Ce:LuAG crystal are fabricated by femtosecond laser using 1030 nm, 450 fs pulses at a 100 kHz repetition rate. The microstructure and composition of femtosecond-laser induced waveguides are studied in detail using SEM, TEM and EDX elemental composition analyses. Efficient single-mode guidance is obtained in the type II waveguide structures with relatively low propagation loss along both TE and TM polarization at 632.8 nm. Based on confocal micro-Raman spectroscopy, the strain-affected regions and the lattice-damaged tracks are demonstrated. The contribution of each effect to the refractive-index distribution are quantitatively determined in combination with beam propagation calculations. The generation of yellow-green fluorescence emission is demonstrated under excitation at 405-nm, retaining well luminescent performance in the Ce:LuAG waveguide.

Ce:LuAG 晶体中的双线波导是通过飞秒激光在 100 kHz 重复频率下使用 1030 nm、450 fs 脉冲制造的。使用 SEM、TEM 和 EDX 元素成分分析详细研究了飞秒激光诱导波导的微观结构和成分。在 632.8 nm 处沿 TE 和 TM 偏振的传播损耗相对较低的 II 型波导结构中获得了有效的单模制导。基于共焦显微拉曼光谱，展示了受应变影响的区域和晶格损坏的轨迹。每种效应对折射率分布的贡献是结合光束传播计算来定量确定的。在 405 nm 的激发下证明了黄绿色荧光发射的产生，