Ultrahigh and persistent optical depths of cesium in Kagomé-type hollow-core photonic crystal fibers

Krzysztof T. Kaczmarek, Dylan J. Saunders, Michael R. Sprague, W. Steven Kolthammer, Amir Feizpour, Patrick M. Ledingham, Benjamin Brecht, Eilon Poem, Ian A. Walmsley, Joshua Nunn

Research output: Contribution to journalArticlepeer-review

34 Citations (SciVal)


Alkali-filled hollow-core fibers are a promising medium for investigating light-matter interactions, especially at the singlephoton level, due to the tight confinement of light and high optical depths achievable by light-induced atomic desorption (LIAD). However, until now these large optical depths could only be generated for seconds, at most once per day, severely limiting the practicality of the technology. Here we report the generation of the highest observed transient (> 105 for up to a minute) and highest observed persistent (>2000 for hours) optical depths of alkali vapors in a light-guiding geometry to date, using a cesium-filled Kagomé-type hollow-core photonic crystal fiber (HC-PCF). Our results pave the way to light-matter interaction experiments in confined geometries requiring long operation times and large atomic number densities, such as generation of single-photon-level nonlinearities and development of single photon quantum memories.

Original languageEnglish
Pages (from-to)5582-5585
Number of pages4
JournalOptics Letters
Issue number23
Publication statusPublished - 1 Dec 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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