Abstract
The absence of Raman and unique pressure-tunable dispersion is the characteristic feature of gas-filled photonic crystal fiber (PCF), and its zero dispersion points can be extended to the near-infrared by increasing gas pressure. The generation of dispersive wave (DW) in the normal group velocity dispersion (GVD) region of PCF is investigated. It is demonstrated that considering the self-steepening (SS) and introducing the chirp of the initial input pulse are two suitable means to control the DW generation. The SS enhances the relative average intensity of blue-shift DW while weakening that of red-shift DW. The required propagation distance of DW emission is markedly varied by introducing the frequency chirp. Manipulating DW generation in gas-filled PCF by the combined effects of either SS or chirp and three-order dispersion (TOD) provides a method for a concentrated transfer of energy into the targeted wavelengths.
Highlights
The high design flexibility of photonic crystal fibers has attracted the attention of many researchers in recent decade [1]
We demonstrate that the controllable generation of dispersive wave (DW) with pumping in the normal group velocity dispersion (GVD) dispersion can be realized by two means: either considering the SS effect of fiber or introducing the frequency chirp of the initial input pulse
The relative average intensity of DWs enhanced as three-order dispersion (TOD) coefficient |δ3| increases; it is noted that the amount of relative average intensity of the DW when the SS effect is neglected is about 20 dB below that of the DW when it is included. These results indicate that the relative average intensity of blue-shift DW is enhanced, rather weakened, and the average position of blue-shift DW can be shifted slightly to the spectral body of the residual pump pulse via considering the SS effect
Summary
The high design flexibility of photonic crystal fibers has attracted the attention of many researchers in recent decade [1]. Advances in Condensed Matter Physics of solitons because the dispersive wave can be emitted even when pumping in the normal dispersion regime in the presence of a zero GVD wavelength [21] In this regime, the physical origin of DW emission, which is perturbed by high-order dispersion, is intimately related to the dispersive shock waves resulting from the nonlinearity overbalancing a weak second-order dispersion [22]. We demonstrate that the controllable generation of DW with pumping in the normal GVD dispersion can be realized by two means: either considering the SS effect of fiber or introducing the frequency chirp of the initial input pulse.
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