Open AccessAnalysis on the longitudinal field strength formed by tightly-focused radially-polarized femtosecond petawatt laser pulse
Author(s) -
Tae Moon Jeong,
S. V. Bulanov,
Stefan Weber,
G. Korn
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.033091
Subject(s) - optics , field strength , laser , femtosecond , physics , electric field , pulse (music) , beam (structure) , field (mathematics) , longitudinal field , materials science , magnetic field , mathematics , quantum mechanics , detector , pure mathematics
Tight focusing of radially- or azimuthally-polarized electromagnetic waves becomes attractive because of the strong field generation in the longitudinal direction. In this paper, we investigate the strength of longitudinal electric field when a radially-polarized femtosecond PW laser pulse is tightly focused by a parabolic surface. From the calculation using the vector diffraction approach, it has been shown that the highest strength of 2.2 × 10 13 V/cm can be reached for the longitudinal field with a radially-polarized 11.2-fs, 11.2-J uniform-beam-profile laser pulse. The difference in the strength of longitudinal field with different beam profile and the spectrum of a laser pulse has been also carefully examined. The propagation of a laser spot has been simulated under an extremely-tight-focusing condition (0.25 in terms of f-number) and an achievable field strength for a standing longitudinal field has been examined by colliding two radially-polarized fs PW-level laser pulses.