1 research outputs found
Generation of subcycle isolated attosecond pulses by pumping ionizing gating
We present a novel approach named as pumping ionizing gating (PIG) for the
generation of isolated attosecond pulses (IAPs). In this regime, a short laser
is used to ionize a pre-existing gas grating, creating a fast-extending plasma
grating(FEPG) having an ionization front propagating with the velocity of
light. A low-intensity long counterpropagating pump pulse is then reflected by
a very narrow region of the ionization front, only where the Bragg conditions
for resonant reflection is satisfied. Consequently, the pump reflection is
confined within a sub-cycle region called PIG, and forms a wide-band coherent
IAP in combination with the frequency up-conversion effect due to the plasma
gradient. This approach results in a new scheme to generate IAPs fromlong
picosecond pump pulses. Three-dimensional (3D) simulations show that a 1.6-ps,
1-{\mu}m pump pulse can be used to generate a 330 as laser pulse with a peak
intensity approximately 33 times that of the pump and a conversion efficiency
of around 0.1%.These results highlight the potential of the PIG method for
generating IAPs with high conversion efficiency and peak intensity.Comment: It provides a new way to generate isolated attosecond pulse(IAP) by a
picosecond pump, which has a protential to boost the IAP energy to joule
leve