Impact Factor:5.2
Journal:Optics & Laser Technology
Abstract:The coupled system of cold atoms and photons guided by a hollow-core fiber (HCF) in ultra-high vacuum (UHV) is widely utilized in quantum optics. Exposing the midsection of the HCF to the ambient atmosphere enhances optical accessibility, enables compact integration, and facilitates atomic near-field sensing. This study proposes a midsection-exposed dual-end venting (ME-DEV) model to predict the spatiotemporal pressure evolution within such configurations. The results indicate that an ultra-low permeability Al2O3 coating effectively suppresses helium permeation. Specifically, a 20-nm coating reduces the steady-state midpoint pressure of a typical HCF from 1.44×10−5 Pa to 4.3×10−8 Pa. This reduction corresponds to an estimated 87Rb lifetime of 40.7s, representing an enhancement by a factor of approximately 333 over that in the uncoated HCF. This work provides a theoretical foundation for compact HCF-based quantum sensors.
Indexed by:Journal paper
Correspondence Author:Wei Li
Translation or Not:no
Date of Publication:2026-06-10
Included Journals:SCI