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The resonance band in hollow-core photonic crystal fiber (HC-PCF), whileleading to high-loss region in the fiber transmission spectrum, has beensuccessfully used for generating phase-matched dispersive wave (DW). Here, wereport that the spectral width of the resonance-induced DW can be largelybroadened due to plasma-driven blueshifting soliton. In the experiment, weobserved that in a short length of Ar-filled single-ring HC-PCF the solitonself-compression and photoionization effects caused a strong spectral blueshiftof the pump pulse, changing the phase-matching condition of the DW emissionprocess. Therefore, broadening of DW spectrum to the longer-wavelength side wasobtained with several spectral peaks, which correspond to the generation of DWat different positions along the fiber. In the simulation, we used super-Gausswindows with different central wavelengths to filter out these DW spectralpeaks, and studied the time-domain characteristics of these peaks respectivelyusing Fourier transform method. The simulation results verified that thesemultiple-peaks on the DW spectrum have different delays in the time domain,agreeing well with our theoretical prediction. Remarkably, we found that thewhole time-domain DW trace can be compressed to ~29 fs using proper chirpcompensation. The experimental and numerical results reported here provide someinsight into the resonance-induced DW generation process in gas-filled HC-PCFs,they could also pave the way to ultrafast pulse generation using DW-emissionmechanism.

Photoionization-induced broadband dispersive wave generated in an Ar-filled hollow-core photonic crystal fiber