Two-dimensional Fourier-transform Spectroscopy of Potassium Vapor

TL;DR

This paper employs two-dimensional Fourier-transform spectroscopy to analyze the coherent optical response of potassium vapor, comparing experimental results with simulations and exploring effects like pulse propagation and Raman coherences.

Contribution

It demonstrates the use of 2DFT spectroscopy on potassium vapor and validates the results with optical Bloch equation simulations, revealing detailed spectral features and propagation effects.

Findings

Good agreement between experiment and simulations.

Identification of non-radiative Raman-like coherences.

Observation of density-dependent spectral distortions.

Abstract

Optical two-dimensional Fourier-transformed (2DFT) spectroscopy is used to study the coherent optical response of potassium vapor in a thin transmission cell. Rephasing and non-rephasing spectra of the D1 and D2 transitions are obtained and compared to numerical simulations. Calculations using the optical Bloch equations gives very good agreement with the experimental peak strengths and line shapes. Non-radiative Raman-like coherences are isolated using a different 2DFT projection. Density-dependent measurements show distortion of 2DFT spectra due to pulse propagation effects.