Abstract
We report the first experimental observation of the interaxial-response-interference in single-beam spin-exchange relaxation-free (SERF) magnetometer. We demonstrate this new form of magneto-optical interaction with atoms, reflected in the time-domain variation of optical signal. Distinguish from the interference phenomenon widely used for sensing, different magnetic-field response rates of multiple axes in atomic sensors will induce frequency-dependent response phase difference, resulting in unexpected signal error. On this basis, we analyze the potential frequency-dependent direction measurement error and abnormal amplitude-frequency response, which enables the pre-estimation of phenomenon when the phase component of external magnetic fields is complex. Orienting to practical applications, we demonstrate the frequency-dependent amplitude error in magnetocardiography (MCG) and propose a method to compensate for the distortion when locating the biomagnetic physiology. A measurement accuracy improvement of 78 % is achieved generally through our method. Our study can be anticipatory extended to various atomic systems, observing and compensating interference-induced measurement error.
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