Optical fiber type atomic magnetometer probe and adjusting method thereof

Abstract

The invention discloses an optical fiber type atomic magnetometer probe and an adjusting method thereof. The optical fiber type atomic magnetometer probe is characterized in that when the polarization of laser transmitted and emitted by optical fiber changes due to the influence of the optical fiber, the light intensity of two beams of linearly polarized light decomposed by a lateral displacement beam splitter prism changes, but the polarization of the two beams of linearly polarized light is stable, and the total light intensity does not change, so that after the two beams of linearly polarized light are converted into circularly polarized light with the same polarization through two quarter-wave plates, through the divergence effect of a convex lens, the two laser beams form laser with stable polarization and stable total light intensity at the atomic gas chamber. According to the invention, the optical fiber type atomic magnetometer probe has no requirement on the polarization maintaining performance of single-mode optical fiber, ensures that the power and polarization of laser entering the atomic gas chamber are stable under the condition of reducing the cost, and further ensures that the performance of the atomic magnetometer is not influenced by the conduction characteristic of the optical fiber on the laser polarization.

Description

technical field [0001] The invention belongs to the field of quantum magnetic sensing, and relates to a fiber optic atomic magnetometer probe and an adjustment method thereof, which are used to reduce the influence of optical fiber transmission performance on the measurement noise of the atomic magnetometer, and further improve the environmental adaptability of the fiber optic atomic magnetometer. Background technique [0002] The atomic magnetometer is a high-precision magnetic sensor based on quantum effects. It is widely used in the field of precise magnetic field measurement and plays an important role in geological exploration, ocean engineering, biomedicine, and target detection. At present, the fiber-optic atomic magnetometer conducts laser light through optical fibers, which separates electronic devices such as lasers and signal processing circuits from the sensing probe, thereby greatly reducing the requirements of the sensing probe for the use environment. Since th...

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Problems solved by technology

A method that directly converts the outgoing laser light into circularly polarized light through a quarter-wave plate. When the laser polarization is affected by a single-mode fiber and undergoes polarization rotation, since the optical axis of the quarter-wave plate cannot be changed in real time, this method It will cause the polarization of the laser light entering the atomic gas cell to become elliptical or even linear, thus affecting the performance of the atomic magnetometer

The other is to purify the polarization of the laser light emitted by the first collimating lens through the polarization element first, and then convert it into circularly polarized light through a quarter-wave plate. Although this method can ensure that the polarization of the laser entering the atomic gas cell is always circular Polarized light, but because the laser light intensity passing through the polarizing element is related to the laser polarization direction of the incident polarizing element, when the polarization rotation of the laser polarization is affected by the single-mode fiber, the laser light intensity passing through the polarizing element will change greatly, which cannot be guaranteed The laser power entering the atomic gas chamber is stabilized, which affects the performance of the atomic magnetometer

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