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초강력 레이저 과학 연구단
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Spatio-temporal modification of femtosecond focal spot under tight focusing condition

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Title
Spatio-temporal modification of femtosecond focal spot under tight focusing condition
Author(s)
Tae Moon Jeong; Weber, S; Le Garrec, B; Margarone, D; Mocek, T; Korn, G
Publication Date
2015-05
Journal
OPTICS EXPRESS, v.23, no.9, pp.11641 - 11656
Publisher
OPTICAL SOC AMER
Abstract
The focusing property of a focal spot of a femtosecond laser pulse is presented under tight focusing conditions (below f-number of 1). The spatial and temporal intensity distributions of a focused electric field are calculated by vector diffraction integrals and coherent superposition method. The validity of the calculation method is examined by comparing the intensity distribution obtained under a high f-number condition to that obtained with the fast Fourier transform method that assumes the scalar paraxial approximation. The spatial and temporal modifications under tight focusing conditions are described for a focused femtosecond laser pulse. The calculation results show that a peak intensity of about 2.5x10(24) W/cm(2) can be achievable by tightly focusing a 12-fs, 10 PW laser pulse with a f/0.5 parabolic optic. The precise information on intensity distributions of a femtosecond focal spot obtained under a tight focusing condition will be crucial in assessing a focused intensity and in describing the motion of charged particles under an extremely strong electric field in ultra-relativistic and/or relativistic laser matter-interaction studies. (C)2015 Optical Society of Americ
URI
https://pr.ibs.re.kr/handle/8788114/2036
ISSN
1094-4087
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
Files in This Item:
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