@article{oai:repo.qst.go.jp:00049486,
 author = {Moon Jeong, Tae and ブラノフ, セルゲイ and Weber, Stefan and Korn, Georg and Bulanov, Sergey},
 issue = {25},
 journal = {Optics Express},
 month = {Dec},
 note = {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 × 1013 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.},
 pages = {33091--33107},
 title = {Analysis on the longitudinal field strength formed by tightly-focused radially-polarized femtosecond petawatt laser pulse”},
 volume = {26},
 year = {2018}
}