Generation of colloidal gold nanoparticles was for the first time studied at ultra-high, multi-MHz repetition rates of 10 ps, 1030 nm laser pulses, ablating 70 nm gold film in water at the constant average power of 270 W and focusing conditions. Ultrafast (550 m s⁻¹) laser scanning of gold films was facilitated by a polygon reflector, provided single-shot per spot through ablation of the films. According to our hypothetical model, the rate-dependent exposure of the films at the constant average power resulted in four-fold increase of the optical density of the colloidal solutions in the interband-transition spectral range (about 400 nm) due to the increasing number of incident pulses over the fixed area of 1 cm 1 cm square, despite the decreasing ablation rate at lower, inversely-proportional fluences and dynamic overlap of plume-induced bubbles.

胶态金纳米颗粒的生成是第一次以10 ps的超高，多MHz重复频率，1030 nm激光脉冲进行研究，在270 W恒定平均功率和聚焦条件下烧蚀水中70 nm金膜。超快（550 ms ^-1）多边形反射镜有助于对金膜进行激光扫描，通过烧蚀金膜可以使每个点单发。根据我们的假设模型，在恒定的平均功率下，薄膜的速率依赖性曝光会导致胶体溶液在带间跃迁光谱范围（约400 nm）内的光密度增加四倍。尽管在较低的，反比例的​​注量和羽流引起的气泡动态重叠的情况下，消融速率有所降低，但在1 cm 1 cm 2的固定区域上的入射脉冲的数量却有所减少。