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Physical Review A

Ultrafast atomic phase modulation

Uvo Holscher, Stephen D. Clow, Thomas C. Weinacht

Published Jul 31, 2009• 3 citations
Publisher

Abstract

We demonstrate a phenomenon very similar to electromagnetically induced transparency using a shaped ultrafast laser pulse. Pulse shaping allows us to produce probe and coupling pulses with arbitrary intensities and time delays. The coupling Rabi frequency and probe bandwidth are both on the order of 1 THz, which is much larger than the natural or Doppler broadened linewidth of the probe transition. Important dynamics associated with a time-dependent coupling field are discussed.

DOI
10.1103/physreva.80.011812

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We have observed electromagnetically induced absorption (EIA) spectra depending on intensities and detunings of the coupling field in the cycling transition (6S 1/2 , F = 4↔6P 3/2 , F ' = 5) of the Doppler-broadened Cs atomic system. With a weak coupling field, we were able to see an EIA spectrum with a subnatural linewidth. On increasing the intensity of the coupling laser, we found that a transmission dip produced by an electromagnetically induced transparency appeared at the centre of the EIA structure, which is the first time that this has been observed. By detuning the frequency of the coupling laser, we were able to obtain a clear dispersion-like spectrum for blue-side detuning, but we obtained a complicated shape for red-side detuning because of the influences of other hyperfine levels. These results were compared qualitatively with theoretical curves obtained from a simple model.
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