Atomic magnetometer and magnetic sensing method
First Claim
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1. An atomic magnetometer comprising:
- a light source for a probe beam; and
a medium in which the probe beam is to be propagated,wherein said medium is a substance which changes a polarization rotation angle of the probe beam depending on a magnetic field intensity at a first measurement position and a magnetic field intensity at a second measurement position different from the first measurement position, andwherein said atomic magnetometer optically measures directly a difference, on a propagation path of the probe beam, between the magnetic field intensity at the first measurement position and the magnetic field intensity at the second measurement position as a difference in polarization rotation angle.
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Abstract
An atomic magnetometer includes a light source for a probe beam and a medium in which the probe beam is to be propagated. The medium is a substance which changes a polarization rotation angle of the probe beam depending on a magnetic field intensity at a first measurement position and a magnetic field intensity at a second measurement position different from the first measurement position. The atomic magnetometer directly measures a difference between the magnetic field intensity at the first measurement position and the magnetic field intensity at the second measurement position as a difference in polarization rotation angle, along a propagation path of the probe beam.
62 Citations
9 Claims
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1. An atomic magnetometer comprising:
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a light source for a probe beam; and a medium in which the probe beam is to be propagated, wherein said medium is a substance which changes a polarization rotation angle of the probe beam depending on a magnetic field intensity at a first measurement position and a magnetic field intensity at a second measurement position different from the first measurement position, and wherein said atomic magnetometer optically measures directly a difference, on a propagation path of the probe beam, between the magnetic field intensity at the first measurement position and the magnetic field intensity at the second measurement position as a difference in polarization rotation angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A magnetic sensing method for measuring a polarization rotation angle of a probe beam by irradiating an atomic group contained in a hollow portion of a cell with a pump beam to uniformize directions of spin of atoms constituting the atomic group and then by irradiating the spin-polarized atomic group of the atoms with linearly polarized light as the probe beam, said magnetic sensing method comprising:
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introducing the probe beam having a plane of polarization rotated by a magnetic field intensity at a first measurement position to a second measurement position different from the first measurement position so as to permit subtraction of the polarization rotation angle of the probe beam; and obtaining information on a difference between a magnetic field intensity at the first measurement position and a magnetic field intensity at the second measurement position by measuring the polarization rotation angle of the probe beam having passed through the second measurement position.
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Specification