Supercontinuum generation without residual pump peak through multiple coherent pump seeds

TL;DR

This paper introduces a novel supercontinuum generation method using multiple coherent pump seeds, effectively removing residual pump peaks and producing a flatter spectrum in fiber-based systems.

Contribution

It demonstrates a new approach with double bound-state solitons to eliminate residual pump peaks, enhancing supercontinuum flatness and efficiency.

Findings

Residual pump peak is eliminated in the new scheme.

Double bound-state solitons improve energy transfer efficiency.

The method produces a flatter supercontinuum spectrum.

Abstract

Residual pump peak in fiber-based supercontinuum, as a general phenomenon, limits its practical application. We report a novel supercontinuum generation (SCG) in a conventional highly nonlinear fiber (HNLF) through multiple coherent pump technique, which eliminates the residual pump peak existed in conventional SCG. The multiple coherent pump technique is realized by double bound-state solitons achieved from a homemade modelocked fiber laser. We further compare the SCGs pumped by conventional bound-state soliton and single soliton. It confirms that the effective elimination of the residual pump peak in supercontinuum owes to higher transferring efficiency of the pump energy to new generated frequencies in the multiple coherent pump scheme. The use of multiple coherent pump scheme, i.e., double bound-state solitons, provides a new, simple and promising method to obtain flat supercontinuum source.