Département d’Optique PM Duffieux, Institut FEMTO-ST, UMR 6174 CNRS Université de Franche-Comté, Besancon, France. francois.courvoisier@femto‑st.fr
Opt Lett. 2012 May 15;37(10):1736-8. doi: 10.1364/OL.37.001736.
We use caustic beam shaping on 100 fs pulses to experimentally generate nonparaxial accelerating beams along a 60° circular arc, moving laterally by 14 µm over a 28 µm propagation length. This is the highest degree of transverse acceleration reported to our knowledge. Using diffraction integral theory and numerical beam propagation simulations, we show that circular acceleration trajectories represent a unique class of nonparaxial diffraction-free beam profile which also preserves the femtosecond temporal structure in the vicinity of the caustic.
我们使用腐蚀性光束整形在 100fs 脉冲上生成非傍轴加速光束，沿着 60°圆弧移动，在 28µm 的传播长度上横向移动 14µm。据我们所知，这是报道的最高程度的横向加速。使用衍射积分理论和数值光束传播模拟，我们表明圆形加速轨迹代表一类独特的非傍轴无衍射光束轮廓，同时在焦散附近保持飞秒时间结构。
