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Multiplexed sub-Doppler spectroscopy with an optical frequency comb

Published

Author(s)

David A. Long, Adam J. Fleisher, David F. Plusquellic, Joseph T. Hodges

Abstract

An optical frequency comb generated with an electro-optic phase modulator and a chirped radiofrequency waveform is used to perform saturation spectroscopy on the D1 and D2 transitions of atomic potassium. With a comb tooth spacing of 2 MHz and a bandwidth of 8 GHz the hyperfine transitions can be simultaneously observed. Interferograms are recorded in as little as 500 ns (a timescale corresponding to the inverse of the comb tooth spacing). Importantly, the sub-Doppler features can be measured as long as the laser carrier frequency lies within the Doppler profile, thus removing the need for slow scanning or a priori knowledge of the frequencies of the sub-Doppler features. Sub-Doppler optical frequency comb spectroscopy has the potential to dramatically reduce acquisition times and allow for rapid and accurate assignment of complex molecular and atomic spectra which are presently intractable.
Citation
Physical Review Letters
Volume
94
Issue
6

Keywords

Laser spectroscopy, fine and hyperfine structure, modulation, optical frequency comb
Created December 13, 2016, Updated November 10, 2018