Theoretical Simulation of 87Rb Absorption Spectrum in a Thermal Cell

TL;DR

This paper presents a theoretical model that accurately simulates the 87Rb absorption spectrum in a thermal cell, matching experimental observations and enabling precise determination of atomic transition parameters.

Contribution

The paper introduces a comprehensive theoretical simulation method for 87Rb spectra that adapts to experimental data, including Doppler broadening, VSOP dips, and EIT features.

Findings

The model accurately fits experimental spectra using non-linear least squares.

It enables precise extraction of transition parameters like decay rates and coupling power.

The simulation captures complex spectral features such as VSOP and EIT in thermal cells.

Abstract

In this paper, we present a theoretical simulation of 87Rb absorption spectrum in a thermal cm-cell which is adaptive to the experimental observation. In experiment, the coupling and probe beams are configured to copropagate but perpendicular polarized, making up to five velocity selective optical pumping (VSOP) absorption dips able to be identified. A $\Lambda$-type electromagnetically induced transparency (EIT) is also observed for each group of velocity-selected atoms. The spectrum by only sweeping the probe beam can be decomposed into a combination of Doppler-broadened background and three VSOP dips for each group of velocity-selected atoms, companied by an EIT peak. This proposed theoretical model can be used to simulate the spectrum adaptive to the experimental observation by non-linear least-square fit method. The fit for high quality of experimental observation can determine valuable transition parameters such as decaying rates and coupling beam power accurately.