Dipole\u2013Dipole Broadening in the Selective Reflection of an Intense Laser Beam from the Interface between a Transparent Dielectric and a Dense Resonance Gas

A A Bobrov,V A Sautenkov,B B Zelener,S A Saakyan

doi:10.1134/s0021364021210086

Abstract

The dipole–dipole broadening of the spectrum of the selective reflection of intense resonance light from the interface between a transparent dielectric and a gas of the natural mixture of Rb isotopes has been studied experimentally. The case of a high gas density where the Doppler broadening can be neglected has been investigated. It has been shown that dipole–dipole broadening is reduced with increasing the number density of excited atoms. When the laser beam intensity is much higher than the saturation intensity of a resonance transition, a significant broadening due to the very high laser beam intensity has not been observed in the reflection spectrum from the transparent dielectric/gas interface. The observed intensity dependence of the spectral width has been explained by the quenching collisions of the excited atoms with the interface.

Highlights

Where d is the dipole moment of the transition, N is the number density of atoms, and α is the coefficient about unity
To achieve a significant population of the excited state of the absorbing gaseous medium, an intense laser pump beam far detuned from the resonance was used in [3]
We previously studied the selective reflection of a laser beam of moderate intensity, up to the saturation intensity [11]

Summary

Introduction

Where d is the dipole moment of the transition, N is the number density of atoms, and α is the coefficient about unity. The population of the excited state cannot be neglected in the case of irradiation of the gas of resonant atoms by an intense laser beam.

Objectives

Results

Conclusion