Second harmonic generation in multimode graded-index fibers: spatial beam cleaning and multiple harmonic sideband generation.

Date publication

mars 2017

Journal

Optics letters

Auteurs

Membres identifiés du Cancéropôle Est :
Pr MILLOT Guy

Tous les auteurs :
Ceoldo D, Krupa K, Tonello A, Couderc V, Modotto D, Minoni U, Millot G, Wabnitz S

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/28248344

Résumé

We study experimentally and numerically the spectral and spatial dynamics of second harmonic generation in an all-optically poled multimode graded-index fiber. In contrast with poled single-mode fibers, in a multimode graded-index fiber a pump can generate a series of sharp sidebands around its second harmonic (SH) that originate from the sub-millimetric periodic evolution of the intensity at the fundamental frequency. The mutual interaction between the fundamental and its SH may also strongly affect the spatial distribution of guided light for both colors: when increasing the pump power, both fundamental and SH output beams evolve from disordered multimode speckles into two bell-shaped beams.

Référence

Opt Lett. 2017 03 1;42(5):971-974