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Recent developments in single-ring hollow-core photonic crystal fibre (SR-PCF) have made possible robust single-mode guidance over a broad bandwidth [1]—an important attribute in many applications, for example high power delivery of laser light and ultrafast gas-based nonlinear optics. Here we report for the first time that these fibres can be designed to transmit just one circular polarisation state...
Single-ring hollow core photonic crystal fibre (SR-PCF) has created much interest over the past several years because of the simplicity of the structure, relatively low transmission losses and broad guidance bands. SR-PCF consists of a ring of thin-walled capillaries (inner diameter d) arranged symmetrically around a central hollow core (diameter D). It has been shown that if d/D = 0.682, the LPci-like...
We report robust guidance of light in coreless photonic crystal fibers that are twisted helically during manufacture. The measured near-field profiles and dispersion of these unusual modes agree well with finite element modeling.
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