Abstract

There is growing interest in using Hollow-core photonic crystal fiber (HC-PCF) in atomic based laser metrology and quantum optics [1]. Atom-filled HC-PCF represents a compact atomic vapour cell, which thanks to its long light-matter interaction distance enhances spectroscopic feature contrasts and optical nonlinearities. These advantages make atom-filled HC-PCF an outstanding candidate for numerous applications such as miniature atomic clocks, magnetometers, single photon sources, Rydberg-blockade based NOT gates, atom-light entanglement etc [1-4]. Furthermore, the small geometric core size of HC-PCF (5 to 100 µm) and large inner wall surface volume enhance atom-surface effects like physicochemical processes, surface material adsorption, Van der Waals (VW) interaction and Casimir Polder forces, which play a significant role in spectroscopic features that strongly differ from the conventional macroscopic vapor cells. Here we report on experimental observation of wall surface induced sub-Doppler transparencies in Rb-filled Kagome HC-PCF, which dramatically contrast with conventional sub-Doppler transparencies generated techniques (e.g. SAS, EIT). The present transparencies are generated by using one single laser beam injected into Rb loaded Kagome HC-PCF.

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