Birefringence and dichroism effects in the spin noise spectra of a spin-1 system

• URL: http://arxiv.org/abs/2202.10896v2
• Date: Wed, 9 Nov 2022 08:59:32 GMT
• Title: Birefringence and dichroism effects in the spin noise spectra of a spin-1 system
• Authors: S. Liu, P. Neveu, L. Hemmen, E. Brion, E. Wu, F. Bretenaker, and F. Goldfarb
• Abstract summary: We perform spin noise spectroscopy experiments in metastable helium atoms at room temperature. The simple structure of metastable helium allows us to probe, model and explain the changes in the behavior of these peaks.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We perform spin noise spectroscopy experiments in metastable helium atoms at room temperature, with a probe light whose frequency is blue detuned from the D0 line. Both circular birefringence fluctuations (Faraday noise) and linear birefringence fluctuations (ellipticity noise) are explored theoretically and experimentally. In particular, it is shown that in both cases but for different optical detunings, two noise resonances are isolated at the Larmor frequency and at twice the Larmor frequency with a behaviour, which strongly depends on the orientation of the probe field polarization. The simple structure of metastable helium allows us to probe, model and explain the changes in the behavior of these peaks in terms of circular and linear dichroisms and birefringences as well as in terms of spin oscillation modes.

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