Laser-noise-induced correlations and anti-correlations in Electromagnetically Induced Transparency

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 ${}^{85}$Rb $D_2$ line ($\lambda =780$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.

Accepted for publication in EPJ D

References in corpus (4)

• Stationary pulses of light in an atomic medium
• From EIT photon correlations to Raman anti-correlations in coherently prepared Rb vapor
• Applications of Electromagnetically Induced Transparency to Quantum Information Processing
• Phase correlation of laser waves with arbitrary frequency spacing

Cited by in corpus (10)

• Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
• Power-Broadening-Free Correlation Spectroscopy in Cold Atoms
• Coupling of four-wave mixing and Raman scattering by ground-state atomic coherence
• Intensity correlations in resonance nonlinear magneto-optical rotation
• Intensity correlations in the forward four-wave mixing driven by a single pump
• Coherence assisted resonance with sub-lifetime-limited linewidth
• Atomic noise spectra in nonlinear magneto-optical rotation in a rubidium vapor
• Perturbative approach in the frequency domain for the intensity correlation spectrum at electromagnetically induced transparency
• Probing light forces on cold atoms by noise correlation spectroscopy
• Correlation spectroscopy in cold atoms: light sidebands resonances in electromagnetically induced transparency condition