Cascade coherence transfer and magneto-optical resonances at 455 nm excitation of Cesium

TL;DR

This paper investigates nonlinear magneto-optical resonances in cesium using 455 nm laser excitation, combining experimental measurements with theoretical modeling based on optical Bloch equations to understand cascade transitions and fluorescence signals.

Contribution

It provides the first combined experimental and theoretical analysis of cascade magneto-optical resonances at 455 nm in cesium, extending existing models to new excitation pathways.

Findings

Good agreement between measured and calculated signals

Cascade transitions significantly influence resonance signals

Model effectively predicts fluorescence behavior at 455 nm

Abstract

We present and experimental and theoretical study of nonlinear magneto-optical resonances observed in the fluorescence to the ground state from the 7P_{3/2} state of cesium, which was populated directly by laser radiation at 455 nm, and from the 6P_{1/2} and 6P_{3/2} states, which were populated via cascade transitions that started from the 7P_{3/2} state and passed through various intermediate states. The laser-induced fluorescence (LIF) was observed as the magnetic field was scanned through zero. Signals were recorded for the two orthogonal, linearly polarized components of the LIF. We compared the measured signals with the results of calculations from a model that was based on the optical Bloch equations and averaged over the Doppler profile. This model was adapted from a model that had been developed for D_1 and D_2 excitation of alkali metal atoms. The calculations agree quite well with the measurements, especially when taking into account the fact that some experimental parameters were only estimated in the model.