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We demonstrate that the phase-matched dispersive wave (DW) emission withinthe resonance band of a 25-cm-long gas-filled hollow-core photonic crystalfiber (HC-PCF) can be strongly enhanced by the photoionization effect of thepump pulse. In the experiments we observe that as the pulse energy increases,the pump pulse gradually shifts to shorter wavelengths due to soliton-plasmainteractions. When the central wavelength of the blueshifting soliton is closeto the resonance band of the HC-PCF, high-efficiency energy transfer from thepump light to the DW in the visible region can be obtained. During this DWemission process, we also observe that the spectral center of the DW graduallyshifts to longer wavelengths leading to a slightly-increased DW bandwidth,which can be well explained as the consequence of phase-matched couplingbetween the pump pulse and the DW. In particular, at an input pulse energy of 6uJ, the spectral ratio of the DW at the fiber output is measured to be as highas ~53% together with a conversion efficiency of ~19%. These experimentalresults, explained by numerical simulations, pave the way to high-brightnesslight sources based on high-efficiency frequency-upconversion processes ingas-filled HC-PCFs.

Photoionization-assisted, high-efficiency emission of dispersive wave in gas-filled hollow-core photonic crystal fibers