Sidebands suppression of 852 nm Cesium Faraday anomalous dispersion optical filter by argon gas

TL;DR

This paper investigates how argon buffer gas suppresses sidebands in a cesium Faraday anomalous dispersion optical filter at 852 nm, achieving high transmittance and providing insights into depopulation effects that can be applied to similar atomic systems.

Contribution

It demonstrates the effect of argon buffer gas on sidebands suppression in cesium FADOFs and analyzes the underlying depopulation mechanism, offering a generalizable approach for other alkali metal atom filters.

Findings

High transmittance up to 80% at increased Ar pressure

Sidebands suppression due to depopulation enhancement by buffer gas

Potential application to other alkali metal FADOFs

Abstract

In this work, sidebands suppression brought by buffer gas argon (Ar) in cesium Faraday anomalous dispersion optical filter (FADOF) at 852 nm is investigated. FADOF performances at different Ar pressures (0 torr, 1 torr, 5 torr and 10 torr) are compared, and a single-peak transmittance spectrum with peak transmittance up to 80% is achieved at the high Ar pressure. A detailed analysis shows that, this sidebands suppression comes from the depopulation enhancement by the buffer gas. This result can be generalized to other FADOFs with similar level structures such as the D2 lines of other alkali metal atoms.