A two-pulse experiment demonstrates ponderomotive clearing of electrons from a laser focus at 300 fs delay, while a 150 fs delay can increase electron density due to ring-like beam structure.
On the observation of vacuum birefringence
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Ponderomotive-expulsion: toward creating an electron-free volume
A two-pulse experiment demonstrates ponderomotive clearing of electrons from a laser focus at 300 fs delay, while a 150 fs delay can increase electron density due to ring-like beam structure.