Fiber-integrated spectroscopy device for hot alkali vapor

TL;DR

This paper presents a novel fiber-integrated spectroscopy device for hot alkali vapors, enabling controlled vapor density and refilling, with potential applications in alkali vapor analysis.

Contribution

It introduces an all-glass, vacuum-tight, fiber-integrated device with a decentered splicing method for alkali vapor spectroscopy, allowing vapor control and refilling.

Findings

Successful fabrication of a fiber-integrated alkali vapor cell

Demonstrated control of vapor density inside the device

Achieved efficient light guidance at multiple wavelengths

Abstract

We introduce an all-glass, vacuum tight, fiber-integrated and alkali compatible spectroscopy device consisting of two conventional optical fibers spliced to each end of a capillary. This is mainly realized through a decentered splicing method allowing refilling of the capillary and controlling the vapor density inside. We analyze the light guidance of the setup through simulations and measurements of the transmission efficiency at different wavelengths and show that filling it with highly reactive alkali metals is possible, and that the vapor density can be controlled reliably.