Extended parametric gain range in photonic crystal fibers with strongly frequency-dependent field distributions Petersen, Sidsel R. ; Alkeskjold, Thomas T. ; Olausson, Christina B. ; Lægsgaard, Jesper Abstract Publication: Optics Letters Pub Date: August 2014 DOI: 10.1364/OL.39.004891 Bibcode: 2014OptL...39.4891P