Abstract
We present the results of an investigation of ultimately achievable parameters of a prospective scheme of an all-optical magnetic field sensor developed for biological applications such as non-zero field magnetoencephalography and magnetocardiography. The scheme performs hyperfine and Zeeman optical pumping, as well as excitation and detection of magnetic resonance, by means of a single laser beam with time-modulated ellipticity. It does not require the use of radio frequency fields, a feature that is essential when creating arrays of sensors. The results of experimental studies allow us to estimate the ultimate sensitivity of the scheme and optimize its optical pumping parameters
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