Tighter focus for ultrashort pulse vector light beams:
change of the relative contribution of different field components to
the focal spot upon pulse shortening
1Image Processing Systems Institute–Branch of the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences, 151 Molodogvardeyskaya Str., Samara 443001, Russia
2Samara National Research University, 34 Moskovskoye Shosse, Samara 443086, Russia
Svetlana N. Khonina and Ilya Golub, "Tighter focus for ultrashort pulse vector light beams: change of the relative contribution of different field components to the focal spot upon pulse shortening," J. Opt. Soc. Am. A 35, 985-991 (2018)
We investigate the focusing of Poisson-spectrum few cycle pulsed light
beams for linear, circular, azimuthal, and radial input polarizations
with and without a first-order vortex. It is shown that, for all the
considered cases, the focal spot is tighter when compared to long
pulses due to the increased blue frequency content in the ultrashort
pulses spectrum. More significantly, we show, for what we believe is
the first time, that upon pulse shortening different focused beam
vector components associated with different Bessel functions
and undergo a change in the relative weight
of their respective contribution to the focal spot size. This effect
is caused by the different spectral dependencies of
and near the focus. This newly discovered
property of broadband ultrashort pulses could be exploited in
light–matter interactions advantageously.
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