Evolution of spatial properties of laser beams during second-harmonic generation

作者：Yinbo Zheng, Yujie Peng, Yingbin Long, Jianyu Sun, Menghua Huang, Yuxin Leng · 发表于：Chinese Optics Letters · 年份：2025 · DOI：10.3788/col202523.091406 · 被引用次数：1 · 研究领域：Laser-Matter Interactions and Applications、Laser Design and Applications、Solid State Laser Technologies

This work investigates spatial evolution characteristics during second-harmonic generation (SHG) through numerical and experimental study by employing a dual-pass Nd: YLF amplifier chain.Through simultaneous monitoring of conversion efficiency dynamics and beam profile evolution, we demonstrate that the spatial uniformity follows deterministic transformation patterns during nonlinear frequency conversion.Notably, optimization of beam uniformity was achieved at the fundamental power density of 0.478 GW/cm 2 in our configuration, while maintaining conversion efficiency exceeding 85%.