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Updated: Jun 21, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Parametrising harmonic strengths in Raman driven spin noise spectra of neutral atoms
Sayari Majumder1, Saptarishi Chaudhuri2
1Raman Research Institute, C. V. Raman Avenue, 5th Cross Road, Sadashivanagar, Bengaluru, Karnataka, 560080, India. sayari@rrimail.rri.res.in.
Abstract:
We study the appearance of harmonics in spin noise correlations as a result of strong optical drive using a pair of coherent Raman beams in hot Rubidium vapour. In addition to the fundamental spin noise mode, we detect multiple equi-spaced coherence signals, including first, second, third, and fourth harmonics with relative amplitudes ranging from [Formula: see text] to [Formula: see text]. We parametrise these higher harmonics with Raman and probe beam intensity, density of atoms, magnetic field strength and drive frequency. These observations allow us to precisely estimate the energy spacing between magnetic sub-levels in a multi-level atomic system under the influence of external magnetic fields. Our findings highlight this method as a versatile tool for optical probing and precision metrology of complex spin dynamics.
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