Blue-enhanced Supercontinuum Generation in a Fluorine-doped Graded-index Multimode Fiber

TL;DR

This paper demonstrates blue-enhanced supercontinuum generation in fluorine-doped graded-index multimode fiber using a 1064 nm picosecond laser, achieving a broad spectrum from 400 to 2400 nm, and highlights the role of fiber composition in nonlinear control.

Contribution

It introduces fluorine-doped graded-index multimode fiber as a new platform for broadband supercontinuum generation with improved spectral control through glass composition engineering.

Findings

Achieved supercontinuum from ~400 nm to 2400 nm in a short fiber

Compared nonlinear properties with germanium-doped fibers

Showed glass composition engineering controls nonlinear dynamics

Abstract

Blue-enhanced, broadband supercontinuum generation in a 50 um core fluorine-doped graded-index multimode fiber is demonstrated by pumping with a 1064 nm picosecond source. Multi-octave supercontinuum spectrum extending from ~400 nm to 2,400 nm is achieved in a relatively short fiber. The measured spectrum and multimode nonlinear properties are compared to those of a germanium-doped graded-index multimode fiber. It is shown that engineering the glass composition and thus its chromatic dispersion and absorption characteristics, provides a novel and effective approach to further controlling the nonlinear dynamics in highly multimoded parabolic-index fibers.