Open AccessIntensity distribution of the flat-topped beam propagating through the thick nonlinear medium with defects
Author(s) -
Xueqiong Chen,
Ziyang Chen,
Jixiong Pu,
Jianqiang Zhu,
Guowen Zhang
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.044213
Subject(s) - intensity (physics) , beam (structure) , nonlinear medium , optics , amplitude , nonlinear system , physics , position (finance) , light intensity , materials science , nonlinear optics , laser , quantum mechanics , finance , economics
Based on the nonlinear Schrödinger equation and Fourier transformation, the intensity distributions of the high power flat-topped beam propagating in the nonlinear medium and the free space are studied. The influences of the defects on medium surface on the intensity evolution of flat-topped light beam in the medium and the free space are analyzed. The results show that the larger the beam order, the poorer the beam self-focusing property is, and the closer to the back surface of the medium the position related to the maximal intensity point is a stronger initial intensity, a thicker medium or a higher nonlinear coefficient will lead to a stronger self-focusing property. The defects on the surface of medium will produce a relatively large intensity, closer to the back surface of medium. The effect of the phase modulated defect on the intensity evolution is greater than that of amplitude modulated defect.