Study of gas dynamics in hollow-core photonic crystal fibers

The unique design of hollow-core photonic crystal fibers (HC-PCFs) has attracted a lot of researchers' attention. Their hollow-core structure with low transmission loss allow strong light-gas interaction inside the fiber, making HC-PCF a strong candidate as portable gas cells for sensing or spectroscopic purposes. Gas-filled HC-PCFs also have applications in the study of Raman scattering (SRS) transient regime and waveguides research. Considering the design of the cell, it is important to understand the gas flow dynamic, for example, estimate the evacuation or gas filling time for a certain length of fiber. In this paper, the gas dynamics theory and the comparison between single- and double-end pumping in special HC-PCFs is investigated. For two different types of HC-PCFs, our experimental data verified the trend for pressure decrease during the evacuation process was consistent with the theoretical prediction. After adding a correction factor, which represents the hollow-core structure of the fiber, to the existing model, the simulation results matched well with the experimental observation.

Automated summary

The unique design of hollow-core photonic crystal fibers (HC-PCFs) has attracted attention for its potential applications in gas sensing and spectroscopy. Understanding gas flow dynamics in fiber design is crucial for estimating evacuation or gas filling time, with experimental data supporting theoretical predictions in pressure decrease trends. Integration of a correction factor representing the fiber's hollow-core structure improved simulation results accuracy.