Open AccessThe study of spatiotemporal perturbation in the nonlinear propagation of broadband chirped pulsed laser
Author(s) -
Canhua Wang,
Lifu Zhang,
Xinghu Fu,
Shuangchun Wen
Publication year - 2010
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.59.6224
Subject(s) - chirp , physics , nonlinear system , optics , perturbation (astronomy) , nonlinear schrödinger equation , broadband , laser , instability , modulation (music) , perturbation theory (quantum mechanics) , computational physics , acoustics , quantum mechanics
In the paper, we extended the propagation equation of the large chirped pulse based on the nonlinear Schrodinger equation, and then analyzed the spatiotemporal instability of chirped pulsed-beam by using the perturbation theory. The influence of the spatiotemporal noise and the effect of chirp on the perturbation modulation of noise of the broadband pulsed-laser with large chirp were investigated theoretically. The results showed that the chirp of pulse has no direct influence on the modulation growth of noise under the same value of γI0(the product of the nonlinear coefficient and the peak intensity). Then the spatial small-scale self-focusing of chirped pulse was measured in experiment using nonlinear medium, and the modulation growth of the temporal noise of the broadband chirped pulse were also simulated numerically, and the result was basically consistent with the analysis of perturbation theory.