Development of Hypocycloid Core shape Kagome HC-PCF for Atomic Vapour Applications

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• Tom Bradley (Xlim Research Institute, Limoges, France)
• Monday 11 November 2013, 14:00-15:00
• Physics East 217.

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Photonic bandgap (PBG) and inhibited coupling (IC) Kagome hollow core photonic crystal fibre (HC-PCF) have diverse applications in light matter interactions because of the enhancement of optical nonlinearities and spectroscopic contrasts. The intrinsic limitations of PBG guiding HC-PCF included limited optical bandwidth (< 70 THz), surface mode propagation and overlap with the silica core surround. Hypocycloid core shape Kagome HC-PCF now compete with PBG HC -PCF in terms of optical attenuation while offering increased optical bandwidth, reduced overlap with silica core surround and large core diameters for atomic vapour loading. A numerical and experimental study demonstrates the inherent advantages of hypocycloid core shape Kagome HC-PCF. Atomic vapours confined in the core of PBG and Kagome HC-PCF experience increased dephasing from enhanced atom-wall interactions due to the confined hollow core geometry. In bulk geometries antirelaxation coatings have been investigated extensively, demonstrating up to 1 million atom wall collisions before dephasing. However in HC-PCF the performance of antirelaxation coatings is still debated, here a comparative study utilising a modified Franzen technique for the first time in HC-PCF demonstrates the performance of antirelaxation coatings in a confined geometry.

This talk is part of the Cold Atoms series.

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