摘要
Harmonics generated by an intense femtosecond Gaussian laser pulse normally incident on a spiral-shaped thin foil target were studied. By using two-dimensional （2D） particle-in-cell （PIC） simulation, we observed evident odd harmonics signals in the reflection direction and found that the reflected field has a helical structure determined by the target shape. This method provides a new way to generate an intense ultraviolet vortex with high-order topological charge by use of ultrahigh intense laser-driven harmonics.
Harmonics generated by an intense femtosecond Gaussian laser pulse normally incident on a spiral-shaped thin foil target were studied. By using two-dimensional （2D） particle-in-cell （PIC） simulation, we observed evident odd harmonics signals in the reflection direction and found that the reflected field has a helical structure determined by the target shape. This method provides a new way to generate an intense ultraviolet vortex with high-order topological charge by use of ultrahigh intense laser-driven harmonics.
基金
Project supported by the National Basic Research Program of China(Grant Nos.2013CBA01501 and 2013CBA01504)
the National Key Scientific Instrument and Equipment Development Project,China(Grant No.2012YQ120047)
CAS Key Program and National Natural Science Foundation of China(Grant Nos.11135012 and 11375262)
a Project of Higher Educational Science and Technology Program of Shandong Province,China(Grant No.J11LA52)
