Properties of electron lenses produced by ponderomotive potential with Bessel and Laguerre–Gaussian beams

The properties of electron round lenses produced by the ponderomotive potential are investigated in geometrical optics. proportional to intensity distribution a focused first-order Bessel or Laguerre-Gaussian beam is exploited produce an lens and third-order spherical aberration corrector. Several formulas for focal length coefficients thin-lens approximation derived set associated light parameters. When mode field optical small, trajectory calculation results show similar those obtained using formulas. Alternatively, large higher-order aberrations introduced because annular potential. second- beams no focusing power negative aberration; however, they can still be used as circularly symmetric correctors. Results that potential-based phase plate forms refractive index medium with shape considerably more flexible than achieved case conventional electrostatic magnetic presented herein serve guidelines designing preferred fields, thus promoting advancement novel technology optics exploits electron-light interaction.