Two-dimensional electronic spectroscopy of an ultracold gas

Abstract

Femtosecond coherent multidimensional spectroscopy is demonstrated for an ultracold gas. For this, a setup for phase modulation spectroscopy is used to probe the $3^2{\mathrm{S}}_{1/2}-2^2{\mathrm{P}}_{1/2,3/2}$ transition in an 800 $\mu$K-cold sample of ${}^7$Li atoms confined in a magneto-optical trap. The observation of a double quantum coherence response, a signature of interparticle interactions, paves the way for detailed investigations of few- and many-body effects in ultracold atomic and molecular gases using this technique. The experiment combines a frequency resolution of 3 GHz with a potential time resolution of 200 fs, which allows for high-resolution studies of ultracold atoms and molecules both in the frequency and in the time domain.

arXiv comment5 pages, 4 figures. This manuscript has been accepted for publication in Optics Letters. ©2022 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited

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Cited by in corpus (1)

• Optical Two-dimensional Coherent Spectroscopy of Cold Atoms