Speaker
Description
When charged particles interact with laser fields,
they are usually thought to be pushed out from the regions of higher laser intensity
via the mechanism known as the ponderomotive force (PMF).
In contrast to the existing theories, we show that there exist several regimes
in which charged particles are drawn into the regions of strongly focused laser fields.
We derive a simple, covariant and relativistically correct expression
for the ponderomotive laser force that holds for arbitrary strength of field focusing, and for all particle velocities.
We predict three new physical effects: (1) non-relativistic reversal of PMF,
(2) focusing-dependent reversal of PMF, and (3) non-reciprocity of PMF for weakly-relativistic particle velocities.
We investigate an application of the PMF where a radially polarized laser is used to correct nonlinear deformations
in the transverse phase space of an electron bunch.
Whenever the laser-particle interaction is started or terminated in an abrupt way, the dominating first order effect
comes from the quickly oscillating motion at the frequency of the laser. We also propose an application of this
effect where the interaction is broken by a powerful THz kicker pulse, creating a train of microbunches that could be used for stroboscopic attosecond UED experiments.
Funding Agency
VG acknowledges funding from Swedish Research Council (VR 2022-03983).
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