Sending femtosecond pulses in circles: highly nonparaxial accelerating beams |
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Authors: | Courvoisier F Mathis A Froehly L Giust R Furfaro L Lacourt P A Jacquot M Dudley J M |
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Institution: | Département d’Optique PM Duffieux, Institut FEMTO-ST, UMR 6174 CNRS Université de Franche-Comté, Besancon, France. francois.courvoisier@femto?st.fr |
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Abstract: | 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. |
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