TY - JOUR

T1 - Homogenization of Doppler broadening in spin-noise spectroscopy

AU - Petrov, M. Yu

AU - Ryzhov, I. I.

AU - Smirnov, D. S.

AU - Belyaev, L. Yu

AU - Potekhin, R. A.

AU - Glazov, M. M.

AU - Kulyasov, V. N.

AU - Kozlov, G. G.

AU - Aleksandrov, E. B.

AU - Zapasskii, V. S.

PY - 2018/3/5

Y1 - 2018/3/5

N2 - The spin-noise spectroscopy, being a nonperturbative linear optics tool, is still reputed to reveal a number of capabilities specific to nonlinear optics techniques. The effect of the Doppler broadening homogenization discovered in this work essentially widens these unique properties of spin-noise spectroscopy. We investigate spin noise of a classical system - cesium atoms vapor with admixture of buffer gas - by measuring the spin-induced Faraday rotation fluctuations in the region of D2 line. The line, under our experimental conditions, is strongly inhomogeneously broadened due to the Doppler effect. Despite that, optical spectrum of the spin-noise power has the shape typical for the homogeneously broadened line with a dip at the line center. This fact is in stark contrast with the results of previous studies of inhomogeneous quantum dot ensembles and Doppler broadened atomic systems. In addition, the two-color spin-noise measurements have shown, in a highly spectacular way, that fluctuations of the Faraday rotation within the line are either correlated or anticorrelated depending on whether the two wavelengths lie on the same side or on different sides of the resonance. The experimental data are interpreted in the frame of the developed theoretical model which takes into account both kinetics and spin dynamics of Cs atoms. It is shown that the unexpected behavior of the Faraday rotation noise spectra and effective homogenization of the optical transition in the spin-noise measurements are related to smallness of the momentum relaxation time of the atoms as compared with their spin-relaxation time. Our findings demonstrate abilities of spin-noise spectroscopy for studying dynamic properties of inhomogeneously broadened ensembles of randomly moving spins.

AB - The spin-noise spectroscopy, being a nonperturbative linear optics tool, is still reputed to reveal a number of capabilities specific to nonlinear optics techniques. The effect of the Doppler broadening homogenization discovered in this work essentially widens these unique properties of spin-noise spectroscopy. We investigate spin noise of a classical system - cesium atoms vapor with admixture of buffer gas - by measuring the spin-induced Faraday rotation fluctuations in the region of D2 line. The line, under our experimental conditions, is strongly inhomogeneously broadened due to the Doppler effect. Despite that, optical spectrum of the spin-noise power has the shape typical for the homogeneously broadened line with a dip at the line center. This fact is in stark contrast with the results of previous studies of inhomogeneous quantum dot ensembles and Doppler broadened atomic systems. In addition, the two-color spin-noise measurements have shown, in a highly spectacular way, that fluctuations of the Faraday rotation within the line are either correlated or anticorrelated depending on whether the two wavelengths lie on the same side or on different sides of the resonance. The experimental data are interpreted in the frame of the developed theoretical model which takes into account both kinetics and spin dynamics of Cs atoms. It is shown that the unexpected behavior of the Faraday rotation noise spectra and effective homogenization of the optical transition in the spin-noise measurements are related to smallness of the momentum relaxation time of the atoms as compared with their spin-relaxation time. Our findings demonstrate abilities of spin-noise spectroscopy for studying dynamic properties of inhomogeneously broadened ensembles of randomly moving spins.

KW - MAGNETIC-RESONANCE

KW - DYNAMICS

UR - http://www.scopus.com/inward/record.url?scp=85044004089&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/homogenization-doppler-broadening-spinnoise-spectroscopy

U2 - 10.1103/PhysRevA.97.032502

DO - 10.1103/PhysRevA.97.032502

M3 - Article

AN - SCOPUS:85044004089

VL - 97

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

IS - 3

M1 - 032502

ER -