Methods of parametric resonance excitation in the scheme of an optical magnetometric sensor

An experimental comparison of the methods for modulating the parameters of a transverse to the external magnetic field resonant pump radiation in the two-beam scheme of an optical magnetometric sensor (the Bell–Blum scheme), as well as a comparison of these methods with the standard method of radio-frequency excitation of magnetic resonance under conditions of strong laser pumping, is carried out. It is shown that, although the standard method allows for greater suppression of the spin-exchange broadening of the magnetic resonance line by pump light, the Bell–Blum scheme is characterized by advantages that allow obtaining close sensitivities when modulating both the intensity and the polarization of the pump light; at the same time, the Bell–Blum scheme is potentially characterized by a high speed, which is essential for the problems of magnetoencephalography and magnetic resonance imaging of ultraweak fields.