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Related Experiment Videos

Superfluorescence-stimulated photon echoes.

A I Lvovsky1, S R Hartmann, F Moshary

  • 1Department of Physics, Columbia University, New York, New York 10027, USA. Alex.Lvovsky@uni-konstanz.de

Physical Review Letters
|December 18, 2002
PubMed
Summary

Researchers observed a novel echo effect in Rubidium vapor. This phenomenon, induced by spontaneous relaxation, involves superfluorescence and is influenced by Doppler dephasing and rephasing dynamics.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser spectroscopy

Background:

  • Two-photon resonant excitation is a key technique in atomic physics.
  • Superfluorescence is a coherent and amplified spontaneous emission.
  • Echo effects in spectroscopy typically involve stimulated emission processes.

Purpose of the Study:

  • To investigate the generation of conical superfluorescence echo in Rubidium vapor.
  • To explore the role of spontaneous relaxation in inducing echo phenomena.
  • To analyze the influence of Doppler dephasing and rephasing on superfluorescence echo intensity.

Main Methods:

  • Utilizing two closely spaced 778 nm, 4-ps laser pulses for two-photon excitation of the 5S-5D transition in Rb vapor.
  • Generating a ground state grating through the initial excitation pulses.
  • Exciting the ground state grating with a third pulse to produce superfluorescence echo.
  • Analyzing the intensity of the 420-nm superfluorescence echo as a function of the relative delay between excitation pulses.

Main Results:

  • Observed conical yoked superfluorescence echo on the 5S-6P, 420-nm transition in Rb vapor.
  • Demonstrated that the echo intensity is governed by Doppler dephasing and rephasing dynamics.
  • Reported the first observation of an echo effect induced by a spontaneous relaxation process.

Conclusions:

  • The study successfully generated and characterized a novel superfluorescence echo in Rubidium vapor.
  • Doppler dephasing and rephasing play a crucial role in the observed echo dynamics.
  • This work presents the first instance of an echo effect driven by spontaneous relaxation, opening new avenues in coherent spectroscopy.

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