Noise spectroscopy of non-linear magneto optical resonances in Rb vapor

Abstract

Nonlinear magneto-optical (NMO) resonances occurring for near-zero magnetic field are studied in Rb vapor using light-noise spectroscopy. With a balanced detection polarimeter, we observe high contrast variations of the noise power (at fixed analysis frequency) carried by diode laser light resonant with the 5S${}_{1/2}(F=2)\to 5$P${}_{1/2}(F=1)$ transition of ${}^{87}$Rb and transmitted through a rubidium vapor cell, as a function of magnetic field $B$. A symmetric resonance doublet of anti-correlated noise is observed for orthogonal polarizations around $B=0$ as a manifestation of ground state coherence. We also observe sideband noise resonances when the magnetic field produces an atomic Larmor precession at a frequency corresponding to one half of the analysis frequency. The resonances on the light fluctuations are the consequence of phase to amplitude noise conversion owing to nonlinear coherence effects in the response of the atomic medium to the fluctuating field. A theoretical model (derived from linearized Bloch equations) is presented that reproduces the main qualitative features of the experimental signals under simple assumptions.

arXiv comment10 pages, 8 figures, submitted to Physical Review A Revised version

References in corpus (9)

• Storage of light in atomic vapor
• Resonant nonlinear magneto-optical effects in atoms
• Nonlinear magneto-optical rotation with frequency-modulated light
• Experimental Vacuum Squeezing in Rubidium Vapor via Self-Rotation
• Polarization squeezing with cold atoms
• Vacuum Squeezing in Atomic Media via Self-Rotation
• Inhibition of electromagnetically induced absorption due to excited state decoherence in Rb vapor
• Super-poissonian photon statistics and correlations between pump and probe fields in Electromagnetically Induced Transparency
• Temporal build-up of electromagnetically induced transparency and absorption resonances in degenerate two-level transitions

Cited by in corpus (20)

• From EIT photon correlations to Raman anti-correlations in coherently prepared Rb vapor
• "Listening" to the spin noise of conduction electrons in bulk n:GaAs
• Dynamic effects in nonlinear magneto-optics of atoms and molecules
• Laser-noise-induced correlations and anti-correlations in Electromagnetically Induced Transparency
• Faraday-rotation fluctuation spectroscopy with static and oscillating magnetic fields
• Spin noise spectroscopy under resonant optical probing conditions: coherent and non-linear effects
• Numerical investigation of the quantum fluctuations of optical fields transmitted through an atomic medium
• Noise analysis of the atomic superheterodyne receiver based on flat-top laser beams
• Power-Broadening-Free Correlation Spectroscopy in Cold Atoms
• Spectral Narrowing via Quantum Coherence
• Intensity correlations in resonance nonlinear magneto-optical rotation
• Intensity correlations in the forward four-wave mixing driven by a single pump
• Field autocorrelations in electromagnetically induced transparency: Effects of a squeezed probe field
• Atomic noise spectra in nonlinear magneto-optical rotation in a rubidium vapor
• Propagation of small fluctuations in electromagnetically induced transparency. Influence of Doppler width
• Observation of optical Rabi oscillations in transmission signal of atomic vapor under continuous-wave laser excitation
• Stimulated spin noise in an activated crystal
• Perturbative approach in the frequency domain for the intensity correlation spectrum at electromagnetically induced transparency
• Correlation spectroscopy in cold atoms: light sidebands resonances in electromagnetically induced transparency condition
• Enhanced four-wave mixing via crossover resonance in cesium vapor