A Low-power Reversible Alkali Atom Source

TL;DR

This paper introduces a low-power, reversible solid-state device capable of controlling rubidium vapor density within alkali vapor cells, enabling dynamic manipulation for atomic physics applications.

Contribution

It presents a novel electrically-controlled alkali atom source that is low-power, reversible, and suitable for portable cold-atom systems, with demonstrated vapor density control.

Findings

Achieved a twofold increase and decrease in rubidium vapor density.

Operates at low voltage (5 V) and low power (<3.4 mW).

No oxygen emission indicates non-chemical loss of Rb.

Abstract

An electrically-controllable, solid-state, reversible device for sourcing and sinking alkali vapor is presented. When placed inside an alkali vapor cell, both an increase and decrease of the rubidium vapor density by a factor of two are demonstrated through laser absorption spectroscopy on 10 to 15 s time scales. The device requires low voltage (5 V), low power (<3.4 mW peak power), and low energy (<10.7 mJ per 10 s pulse). The absence of oxygen emission during operation is shown through residual gas analysis, indicating Rb is not lost through chemical reaction but rather by ion transport through the designed channel. This device is of interest for atomic physics experiments and, in particular, for portable cold-atom systems where dynamic control of alkali vapor density can enable advances in science and technology.