Abstract
The resonance band in hollow-core photonic crystal fiber (HC-PCF), while leading to high-loss region in the fiber transmission spectrum, has been successfully used for generating phase-matched dispersive wave (DW). Here, we report that the spectral width of the resonance-induced DW can be largely broadened due to plasma-driven blueshifting soliton. In the experiment, we observed that in a short length of Ar-filled single-ring HC-PCF the soliton self-compression and photoionization effects caused a strong spectral blueshift of the pump pulse, changing the phase-matching condition of the DW emission process. Therefore, broadening of DW spectrum to the longer-wavelength side was obtained with several spectral peaks, which correspond to the generation of DW at different positions along the fiber. In particular, we numerically used the super-Gauss windows with different central wavelengths to filter out these DW spectral peaks and studied the time-domain characteristics of these peaks respectively using Fourier transform method. We observed that these multiple-peaks on the DW spectrum have different delays in the time domain, which is in good agreement with our theoretical prediction. More interestingly, we found that the broadband DW with several spectral peaks can be compressed to ~29 fs after proper dispersion compensation. The results reported here, on the one hand, provide some useful insights into the resonance-induced DW generation process in gas-filled HC-PCFs. On the other hand, the DW-emission mechanism could be used to generate the ultrashort light sources with a wide spectral range through using the proper design of the resonance bands of the HC-PCFs, which has many applications in the ultrafast related experiments.
Highlights
In order to better understand the mechanism of photoionization-induced broadband dispersive wave (DW) generated better understand the mechanism of photoionization-induced broadband DW generated in in Ar-filled the Ar-filled
SR hollow-core photonic crystal fiber (HC-PCF), we numerically simulated the propagation of ultrashort the we numerically simulated the propagation of ultrashort pulses pulses along the using the single-mode unidirectional pulse propagation along the SR HC-PCF using the single-mode unidirectional pulse propagation equation equation (UPPE)
4.4.Conclusions conclusion, experimentally numerically demonstrated the photoionizaInInconclusion, wewe experimentally andand numerically demonstrated the photoionizationtion-induced broadband phase-matched with several spectral peaks generated the induced broadband phase-matched DW with several spectral peaks generated in in the resonance band of a
Summary
In the gas-filled HC-PCFs, the combined effects of self-compressed soliton and highorder dispersion can result in phase-matched DW generated in the UV region [1,7]. The experimental result showed that a strong VUV DW emission generated at 182 nm on the trailing edge of the pulse, and it proved that kagomé-style HC-PCF works well in the VUV spectral region. In our recent experiments [18,19], we reported the high-efficiency emission of phase-matched DW in the visible spectral region using a He-filled single-ring (SR) HC-PCF. As the input pulse energy increases, the central wavelength of the plasma-driven blueshifting soliton (BS) [20,21] is close to the resonance band of the fiber, high-efficiency energy transfer from the pump light to the DW can be triggered. We theoretically investigated the time-domain characteristics of these spectral peaks filtered by the super-Gauss windows using Fourier transform method, and numerically showed that via suitable dispersion compensation the DW pulses can be compressed to ~29 fs
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