Abstract
Within the framework of plane-wave angular spectrum analysis of electromagnetic fields, a solution for the field of a tightly focused radially polarized (RP) chirped laser pulse is presented. With this solution, direct laser acceleration of protons by this kind of RP laser pulses is investigated numerically. It is found that a RP laser pulse with proper negative frequency chirps can lead to efficient proton acceleration, reaching sub-GeV at the laser intensity of ${10}^{22}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ from its injection energy of 45 MeV.
Highlights
High-energy protons and heavier ions are widely used in many areas, such as proton cancer therapy [1], proton imaging [2], ion lithography [3], and fast-ion ignition fusion research [4], etc
It is found that a radially polarized (RP) laser pulse with proper negative frequency chirps can lead to efficient proton acceleration, reaching sub-GeV at the laser intensity of 1022 W=cm2 from its injection energy of 45 MeV
It is found that a RP laser pulse with proper negative frequency chirps may lead to efficient proton acceleration
Summary
High-energy protons and heavier ions are widely used in many areas, such as proton cancer therapy [1], proton imaging [2], ion lithography [3], and fast-ion ignition fusion research [4], etc. With the development of high power lasers, a few schemes have been proposed to obtain high-energy proton beams based upon relativistic laserplasma interaction, such as target normal sheath acceleration [5,6], and radiation pressure dominated acceleration [7,8,9]. In these schemes, protons are accelerated by electrostatic fields arising from the charge separation between protons and the laser-pushed electrons. It is proposed to accelerate charged particles especially electrons in vacuum by radially polarized (RP) intense laser beams. It is found that a RP laser pulse with proper negative frequency chirps may lead to efficient proton acceleration
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