Optically pumped magnetometer and magnetoencephalograph

Abstract

An optically pumped magnetometer includes a cell, a pump light incidence unit causing pump light to be incident on a sensitivity region inside the cell in a first direction, a probe light incidence unit causing probe light for detecting change in electron spins to be incident on the sensitivity region in a direction intersecting the first direction, a bias magnetic field coil applying a bias magnetic field in the first direction to the inside of the cell and determining a resonance frequency of the electron spins, a gradient correction coil correcting a gradient of the bias magnetic field, an electron spin tilting unit tilting a rotation axis direction of the electron spins, an optical sensor detecting the probe light having passed through the sensitivity region, and a magnetic field measuring unit measuring a magnetic field strength related to the sensitivity region based on an output of the optical sensor.