Wavelength-agile high-power sources via four-wave mixing in higher-order fiber modes Demas, J. ; Prabhakar, G. ; He, T. ; Ramachandran, S. Abstract Publication: Optics Express Pub Date: April 2017 DOI: 10.1364/OE.25.007455 Bibcode: 2017OExpr..25.7455D