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Air-core photonic bandgap fibers offer many unique properties and are critical to many emerging applications. A notable property is the high nonlinear threshold which provides a foundation for applications at high peak powers. The strong interaction of light and air is also essential for a number of emerging applications, especially those based on nonlinear interactions and spectroscopy. For many...
Square lattice with much higher node-to-strut ratio is promising for significantly extending bandgaps in hollow-core fibres. First such fibres are achieved here. Minimum loss of 67dB/km is demonstrated along with potential for much extended bandgaps.
We have demonstrated ultra high NA fibers of core diameters down to 1.2μm, low confinement loss and very high nonlinearity. Efficient supercontinuum generation is demonstrated in a 2μm core fiber. These fibers can also be spliced to conventional fibers with low loss.
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