Laser-noise-induced correlations and anti-correlations in electromagnetically
induced transparency |
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Authors: | L S Cruz D Felinto JG Aguirre Gómez M Martinelli P Valente A Lezama P Nussenzveig |
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Institution: | 1.Instituto de Física, Universidade de S?o Paulo,S?o Paulo,Brazil;2.Instituto de Física, Facultad de Ingeniería,Montevideo,Uruguay |
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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. |
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Keywords: | |
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