Nonlinear magneto-optical 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 $5{\mathrm{S}}_{1∕2}\phantom{\rule{0.2em}{0ex}}(F=2)\ensuremath{\rightarrow}5{\mathrm{P}}_{1∕2}\phantom{\rule{0.2em}{0ex}}(F=1)$ transition $^{87}\mathrm{Rb}$ and transmitted through a rubidium vapor cell as a function of magnetic field $B$ . A symmetric resonance doublet of anticorrelated 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.Nonlinear magneto-optical 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 $5{\mathrm{S}}_{1∕2}\phantom{\rule{0.2em}{0ex}}(F=2)\ensuremath{\rightarrow}5{\mathrm{P}}_{1∕2}\phantom{\rule{0.2em}{0ex}}(F=1)$ transition $^{87}\mathrm{Rb}$ and transmitted through a rubidium vapor cell as a function of magnetic field $B$. A symmetric resonance doublet of anticorrelated 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:physics/0310068Physical Review AApr 9, 200458 citations

Optical magnetic resonance imaging of Rb vapor in low magnetic fields

J. Skalla, Gerhard Wäckerle, M Mehring +1 more

Physics Letters AFeb 1, 199723 citations

Optical precursor in Rb Vapor

Wenlong Yang, Alexei V. Sokolov

APSOct 1, 20090 citations

^{87}\mathrm{Rb}

and transmitted through a rubidium vapor cell as a function of magnetic field

B

. A symmetric resonance doublet of anticorrelated 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.