Abstract
We numerically investigate the effect of mode-area dispersion in a tubular-type anti-resonant hollow-core fiber by using a modified generalized nonlinear Schrödinger equation that takes into account the wavelength-dependent mode area in its nonlinear term. The pulse evolution dynamics with and without the effect of mode-area dispersion are compared and analyzed. We show that strong dispersion of the mode area in the proximity of the cladding wall thickness-induced resonances has a significant impact on the soliton pulse propagation, resulting in considerable changes in the conversion efficiencies in nonlinear frequency mixing processes. The differences become more prominent when the pump has higher energy and is nearer to a resonance. Hence, the mode-area dispersion must be accounted for when modeling such a case.
Highlights
The anti-resonant hollow-core fiber (AR-HCF) is gaining growing popularity owing to its ability to guide light through a hollow channel [1,2]
While there are a handful of studies reporting the effect of fast variation in the dispersion profile near the cladding-wall thickness-induced resonances on nonlinear pulse propagation in gas-filled AR-HCF, less attention has been paid to the impact of the rapid mode area change around these resonances
We study the cases pumping two propagation dynamics inin a xenon-filled
Summary
The anti-resonant hollow-core fiber (AR-HCF) is gaining growing popularity owing to its ability to guide light through a hollow channel [1,2]. The tubular-type AR-HCF, which consists of several thin-wall dielectric cladding tubes surrounding the central hollow core has a simple structure that is relatively easy to fabricate, yet achieves reasonably low loss [6] It offers a wide transmission window and a high power-damage threshold. While there are a handful of studies reporting the effect of fast variation in the dispersion profile near the cladding-wall thickness-induced resonances on nonlinear pulse propagation in gas-filled AR-HCF, less attention has been paid to the impact of the rapid mode area change around these resonances. The effect of mode-area dispersion has not been thoroughly considered in the past numerical studies that involve nonlinear pulse propagation in gas-filled AR-HCFs. A constant mode area evaluated at the pump wavelength was assumed in most cases. Such a clear impact of the mode-area dispersion in gas-filled AR-HCF has not been observed until now
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