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Updated: Feb 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Frequency combs enable rapid and high-resolution multidimensional coherent spectroscopy
Bachana Lomsadze1, Steven T Cundiff2
1Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA, and JILA, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309, USA.
Abstract:
Dual laser frequency combs can rapidly measure high-resolution linear absorption spectra. However, one-dimensional linear techniques cannot distinguish the sources of resonances in a mixture of different analytes, nor can they separate inhomogeneous and homogeneous broadening. Here, we overcame these limitations by acquiring high-resolution multidimensional nonlinear coherent spectra with frequency combs. We experimentally differentiated and assigned the Doppler-broadened features of two naturally occurring isotopes of rubidium atoms (87Rb and 85Rb) according to the placement of their hyperfine energy states in a two-dimensional spectrum.
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