Research Advances of Visible Supercontinuum Generation in Graded-Index Multimode Fibers
Typically,graded-index multimode fibers feature certain spatiotemporal nonlinear effects such as geometric parametric instability(GPI),which gradually expands the spectrum of transmitted laser light under certain conditions and eventually evolves into a supercontinuum.This paper introduces the concept of GPI and its physical connotations;moreover,the status of research on GPI-induced visible supercontinuum generation in graded-index multimode fibers is reviewed,and an analysis on the influence of fiber and pulse parameters on the output spectrum is presented.In addition to this,realizing an all-fiber structure and using short wavelength lasers as pump sources constitute key future research directions.Overall,the GPI-induced generation of the visible supercontinuum is expected to break through the power limitation of the supercontinuum generated by small core traditional photonic crystal fibers.
NETL
NSTL
万方数据
