The European Physical Journal D

, Volume 41, Issue 3, pp 531–539

Laser-noise-induced correlations and anti-correlations in electromagnetically induced transparency

  • L. S. Cruz
  • D. Felinto
  • J.G. Aguirre Gómez
  • M. Martinelli
  • P. Valente
  • A. Lezama
  • P. Nussenzveig
Optical Physics

DOI: 10.1140/epjd/e2006-00254-4

Cite this article as:
Cruz, L., Felinto, D., Aguirre Gómez, J. et al. Eur. Phys. J. D (2007) 41: 531. doi:10.1140/epjd/e2006-00254-4
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Abstract.

High degrees of intensity correlation between two independent lasers were observed after propagation through a rubidium vapor cell in which they generate Electromagnetically Induced Transparency (EIT). As the optical field intensities are increased, the correlation changes sign (becoming anti-correlation). The experiment was performed in a room temperature rubidium cell, using two diode lasers tuned to the 85Rb D2 line (λ= 780 nm). The cross-correlation spectral function for the pump and probe fields is numerically obtained by modeling the temporal dynamics of both field phases as diffusing processes. We explored the dependence of the atomic response on the atom-field Rabi frequencies, optical detuning and Doppler width. The results show that resonant phase-noise to amplitude-noise conversion is at the origin of the observed signal and the change in sign for the correlation coefficient can be explained as a consequence of the competition between EIT and Raman resonance processes.

PACS.

32.80.Qk Coherent control of atomic interactions with photons42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Authors and Affiliations

  • L. S. Cruz
    • 1
  • D. Felinto
    • 1
  • J.G. Aguirre Gómez
    • 1
  • M. Martinelli
    • 1
  • P. Valente
    • 1
    • 2
  • A. Lezama
    • 2
  • P. Nussenzveig
    • 1
  1. 1.Instituto de Física, Universidade de São PauloSão PauloBrazil
  2. 2.Instituto de Física, Facultad de IngenieríaMontevideoUruguay