Atomic frequency reference at 1033 nm for ytterbium (Yb)-doped fiber lasers and applications exploiting a rubidium (Rb) 5$S_{1/2}$ to 4$D_{5/2}$ one-colour two-photon transition

TL;DR

This paper demonstrates a novel two-photon transition in rubidium using a 1033 nm Yb-doped fiber laser, establishing a new atomic frequency reference with applications in laser stabilization, atomic physics, and quantum communication.

Contribution

First demonstration of a 1033 nm atomic frequency reference and a one-colour two-photon transition in rubidium using a Yb-doped fiber laser.

Findings

Established a new atomic frequency reference at 1033 nm.

Demonstrated a simple setup for two-photon fluorescence spectroscopy.

Potential applications in laser stabilization and quantum technologies.

Abstract

We demonstrate a two-photon transition of rubidium (Rb) atoms from the ground state (5$S_{1/2}$) to the excited state (4$D_{5/2}$), using a home-built ytterbium (Yb)-doped fiber amplifier at 1033 nm. This is the first demonstration of an atomic frequency reference at 1033 nm as well as of a one-colour two-photon transition for the above energy levels. A simple optical setup is presented for the two-photon transition fluorescence spectroscopy, which is useful for frequency stabilization for a broad class of lasers. This spectroscopy has potential applications in the fiber laser industry as a frequency reference, particularly for the Yb-doped fiber lasers. This two-photon transition also has applications in atomic physics as a background- free high- resolution atom detection and for quantum communication, which is outlined in this article.