Controlling the excitation process of free electrons by a femtosecond elliptically polarized laser

Lili Gao, Feng Wang, Lan Jiang, Liangti Qu, Yongfeng Lu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper is focused on the excitation rates of free electrons of an aluminum (Al) bulk irradiated by an elliptically polarized laser in simulation, using time-dependent density functional theory (TDDFT). The polarized 400 nm, 10 fs laser pulse consisted of two elementary sinusoidal beams, and is adjusted by changing the phase difference φ and the intersection angle θ of the polarization directions between the two beams. The simulation includes cases of φ = π/2 with θ = 30°, θ = 45°, θ = 60°, θ = 90°, θ = 120°, θ = 135°, θ = 150°, and cases of θ = 90° with φ = π/4, φ = π/3, φ = π/2, φ = 2π/3, φ = 3π/4. The absorbed energy, the excitation rates and the density distributions of free electrons after laser termination are investigated. At the given power intensity (1×1014Wcm-2), pulse width (10 fs) and wavelength (400 nm) of each elementary laser beam, computational results indicate that the excitation rate of free electrons is impacted by three major factors: the long axis direction of the laser projected profile, the amplitude difference of the first main oscillation (1st AD), and the total amplitude difference of main oscillations (TAD) of the external electric field. Among the aforementioned three factors for the excitation rate of free electrons, the direction of long axis plays the most significant role. The screen effect is crucial to compare the importance of the remaining two factors. The analysis approach to investigate the electron dynamics under an elliptically polarized laser is both pioneering and effective.

Original languageEnglish (US)
Article number1550033
JournalInternational Journal of Modern Physics B
Volume29
Issue number6
DOIs
StatePublished - Mar 10 2015

Fingerprint

free electrons
excitation
lasers
screen effect
oscillations
free electron lasers
intersections
density distribution
pulse duration
simulation
laser beams
density functional theory
aluminum
electric fields
polarization
profiles
pulses
wavelengths
electrons
energy

Keywords

  • Femtosecond laser
  • TDDFT
  • electron dynamics
  • elliptically polarized laser

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

Cite this

Controlling the excitation process of free electrons by a femtosecond elliptically polarized laser. / Gao, Lili; Wang, Feng; Jiang, Lan; Qu, Liangti; Lu, Yongfeng.

In: International Journal of Modern Physics B, Vol. 29, No. 6, 1550033, 10.03.2015.

Research output: Contribution to journalArticle

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