arXiv:2102.00938 · Physical Review A

Nonlinear spectroscopy of high-spin fluctuations

Anatoly A. Fomin, M. Yu. Petrov, I. I. Ryzhov, G. G. Kozlov, Valerii S Zapasskii, Михаил Михайлович Глазов

Published Feb 10, 2021• 8 citations

Abstract

We investigate theoretically and experimentally fluctuations of high spin ($F\phantom{\rule{0.16em}{0ex}}>\phantom{\rule{0.16em}{0ex}}\frac{1}{2}$) beyond the linear response regime and demonstrate dramatic modifications of the spin noise spectra in the high power density probe field. Several effects related to an interplay of high spin and perturbation are predicted theoretically and revealed experimentally, including strong sensitivity of the spin noise spectra to the mutual orientation of the probe polarization plane and magnetic field direction, appearance of high harmonics of the Larmor frequency in the spin noise, and the fine structure of the Larmor peaks. We demonstrate the ability of spin noise spectroscopy to access the nonlinear effects related to the renormalization of the spin states by strong electromagnetic fields.

DOI: 10.1103/physreva.103.023104

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arXiv:2102.00938 · Physical Review A

Nonlinear spectroscopy of high-spin fluctuations

Anatoly A. Fomin, M. Yu. Petrov, I. I. Ryzhov, G. G. Kozlov, Valerii S Zapasskii, Михаил Михайлович Глазов

Published Feb 10, 2021• 8 citations

arXiv HTML PDF

Abstract

We investigate theoretically and experimentally fluctuations of high spin (

F\phantom{\rule{0.16em}{0ex}}>\phantom{\rule{0.16em}{0ex}}\frac{1}{2}

) beyond the linear response regime and demonstrate dramatic modifications of the spin noise spectra in the high power density probe field. Several effects related to an interplay of high spin and perturbation are predicted theoretically and revealed experimentally, including strong sensitivity of the spin noise spectra to the mutual orientation of the probe polarization plane and magnetic field direction, appearance of high harmonics of the Larmor frequency in the spin noise, and the fine structure of the Larmor peaks. We demonstrate the ability of spin noise spectroscopy to access the nonlinear effects related to the renormalization of the spin states by strong electromagnetic fields.

DOI: 10.1103/physreva.103.023104

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Spin-noise spectroscopy of a spin-one system

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Optically pumped magnetometers (OPMs) are revolutionizing the task of magnetic-field sensing due to their extremely high sensitivity combined with technological improvements in miniaturization which have led to compact and portable devices. OPMs can be based on spin-oriented or spin-aligned atomic ensembles which are spin polarized through optical pumping with circular or linear polarized light, respectively. Characterization of OPMs and the dynamical properties of their noise is important for applications in real-time sensing tasks. In our work, we experimentally perform spin noise spectroscopy of an alignment-based magnetometer. Moreover, we propose a stochastic model that predicts the noise power spectra exhibited by the device when, apart from the strong magnetic field responsible for the Larmor precession of the spin, white noise is applied in the perpendicular direction aligned with the pumping-probing beam. By varying the strength of the noise applied as well as the linear-polarization angle of incoming light, we verify the model to accurately predict the heights of the Larmor-induced spectral peaks and their corresponding linewidths. Our work paves the way for alignment-based magnetometers to become operational in real-time sensing tasks. Published by the American Physical Society 2024Optically pumped magnetometers (OPMs) are revolutionizing the task of magnetic-field sensing due to their extremely high sensitivity combined with technological improvements in miniaturization which have led to compact and portable devices. OPMs can be based on spin-oriented or spin-aligned atomic ensembles which are spin polarized through optical pumping with circular or linear polarized light, respectively. Characterization of OPMs and the dynamical properties of their noise is important for applications in real-time sensing tasks. In our work, we experimentally perform spin noise spectroscopy of an alignment-based magnetometer. Moreover, we propose a stochastic model that predicts the noise power spectra exhibited by the device when, apart from the strong magnetic field responsible for the Larmor precession of the spin, white noise is applied in the perpendicular direction aligned with the pumping-probing beam. By varying the strength of the noise applied as well as the linear-polarization angle of incoming light, we verify the model to accurately predict the heights of the Larmor-induced spectral peaks and their corresponding linewidths. Our work paves the way for alignment-based magnetometers to become operational in real-time sensing tasks. Published by the American Physical Society 2024

arXiv:2312.05577Physical Review AJul 30, 202415 citations

We investigate theoretically and experimentally fluctuations of high spin (

F\phantom{\rule{0.16em}{0ex}}>\phantom{\rule{0.16em}{0ex}}\frac{1}{2}

^{4}\mathrm{He}

at room temperature.

{D}_{2}

transition, reveal clear signatures of coherent coupling of the participating electronic levels. The results are explained by extended Bloch equations, including homogeneous and inhomogeneous broadening mechanisms. Our measurements further indicate that spin noise originating from excited states is governed at high intensities by collective effects.

n

:GaAs in the spectral range 835--918 nm. It is shown that the inevitable growth of the probe beam power with the sensitivity gain makes spin noise spectroscopy much more perturbative, but, at the same time, opens up fresh opportunities for studying nonlinear interactions of strong light fields with spin ensembles.

^{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.