Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Lasers and Electro-Optics

Two-Quantum Resonances Observed in Potassium Vapor by Two-Dimensional Fourier-Transform Spectroscopy

Xingcan Dai, Alan D. Bristow, D. Karaiskaj, Shaul Mukamel, Steven T. Cundiff

Published Jan 1, 2009• 0 citations
Publisher

Abstract

Unexpected two-quantum resonances are observed in potassium vapor using two-dimensional Fourier-transform spectroscopy. These transitions are an unambiguous indication of many-body interactions, which arise from the long-range interatomic coupling that is responsible for resonance self-broadening.
DOI
10.1364/iqec.2009.ipdb8

Related papers

Two-Dimensional Fourier-Transform Spectroscopy of Potassium Vapor

Xingcan Dai, Alan D. Bristow, D. Karaiskaj +1 more

Various two-dimensional Fourier-transform spectra of potassium vapor have been obtained to show coherent interactions and isolate Raman-like coherences. The experimental results agree well with numerical calculation based on optical Bloch equations.

Conference on Lasers and Electro-Optics•Jan 1, 2010•21 citations

Two-Quantum Coherences in Optical Two-Dimensional Fourier Transform Spectroscopy

Steven T. Cundiff, D. Karaiskaj, Xingcan Dai +5 more

We present optical two-dimensional Fourier transform spectra for the pulse sequence sensitive to two-quantum coherences. In semiconductors, two-quantum coherences occur due to biexcitons and many-body effects, in a potassium vapor, they arise from atomic interactions.

International Conference on Ultrafast Phenomena•Jan 1, 2010•0 citations

Two-dimensional Fourier-transform spectroscopy of potassium vapor

Xingcan Dai, Alan D. Bristow, D. Karaiskaj +1 more

Optical two-dimensional Fourier-transform (2DFT) spectroscopy is used to study the coherent optical response of potassium vapor in a thin transmission cell. Rephasing and nonrephasing spectra of the ${D}_{1}$ and ${D}_{2}$ transitions are obtained and compared to numerical simulations. Non-perturbative calculations using the optical Bloch equations give very good agreement with the experimental peak strengths and line shapes. Nonradiative Raman-like coherences are isolated using a different 2DFT projection. Comparison between the optical and Raman linewidths shows that dephasing is due to partially correlated energy fluctuations. Density-dependent measurements show distortion of 2DFT spectra due to pulse propagation effects.

arXiv:1001.1955•Physical Review A•Nov 3, 2010•73 citations

Isolating spectral contributions from local field effects in an atomic vapor using two-quantum 2D FT optical spectroscopy

Katherine W. Stone, Keith Adam Nelson

Two-quantum 2D Fourier transform optical spectroscopy is used to separate the contributions of dipole-dipole interactions to the overall nonlinear optical response which isolates them from the atomic resonances in rubidium vapor that generated them.

International Conference on Ultrafast Phenomena•Jan 1, 2010•0 citations

Two-Dimensional Double-Quantum Spectra Reveal Collective Resonances in an Atomic Vapor

Xingcan Dai, Marten Richter, Hebin Li +4 more

We report the observation of double-quantum coherence signals in a gas of potassium atoms at twice the frequency of the one-quantum coherences. Since a single atom does not have a state at the corresponding energy, this observation must be attributed to a collective resonance involving multiple atoms. These resonances are induced by weak interatomic dipole-dipole interactions, which means that the atoms cannot be treated in isolation, even at a low density of 10(12) cm(-3).

arXiv:1112.0336•Physical Review Letters•May 7, 2012•138 citations

Optical Multidimensional Spectroscopy of Atomic Vapor

Hebin Li, Galan Moody, Alan D. Bristow +2 more

Optical single- and double-quantum three-dimensional Fourier-transform spectra are obtained for atomic vapors. We show that three-dimensional spectra can be used to identify the Hamiltonian of complex systems and to reveal the nature of many-body interactions.

EPJ Web of Conferences•Jan 1, 2013•1 citation
Optical two-dimensional Fourier-transform (2DFT) spectroscopy is used to study the coherent optical response of potassium vapor in a thin transmission cell. Rephasing and nonrephasing spectra of the D1{D}_{1}D1​ and D2{D}_{2}D2​ transitions are obtained and compared to numerical simulations. Non-perturbative calculations using the optical Bloch equations give very good agreement with the experimental peak strengths and line shapes. Nonradiative Raman-like coherences are isolated using a different 2DFT projection. Comparison between the optical and Raman linewidths shows that dephasing is due to partially correlated energy fluctuations. Density-dependent measurements show distortion of 2DFT spectra due to pulse propagation effects.