A magnetic field gradient detection method based on the magneto-optic effect in an optical microcavity

Abstract

The invention discloses a magnetic field gradient detection method based on the magneto-optic effect in an optical microcavity, which belongs to the field of magneto-optic detection. After passing through the core components respectively, the four output fibers correspond to the four oscilloscopes; the core components include a microwave transmitter and four microsphere cavity arrays; then, fix the orthogonal directions of the two microwave excitations respectively to construct a plane x, y coordinate system ;Turn off the y direction, turn on the laser excitation in the x direction, and modulate the polarization direction to be the direction of the transverse electric field; when the oscilloscope shows 0, turn on the microwave transmitter, and calculate the magnetic field gradient in the x direction under the joint action of the microwave signal and the magnetic field; Similarly, the magnetic field gradient in the y direction is repeatedly calculated, and finally, the magnetic field gradient vector (x, y) on the two-dimensional surface is comprehensively constructed. The invention has excellent long-distance detection and complex environment coping capabilities.

Description

technical field [0001] The invention relates to the field of magneto-optical detection, in particular to a magnetic field gradient detection method based on the magneto-optic effect in an optical microcavity. Background technique [0002] An optical microcavity is a micron-scale device characterized by a highly localized optical field, where the optical field interacts strongly with the magnetic field. In a spherical optical microcavity, the whispering gallery mode is an important mode of the light field. From the perspective of ray optics, there is total reflection of light in the whispering gallery microcavity. In addition, the stability requirement of the light field is: in the optical microcavity of the whispering gallery, the optical path generated by the photon running for one cycle is an integer multiple of the photon wavelength. The frequency corresponding to this wavelength is the eigenfrequency of the whispering gallery mode, and it is also the maximum absorption ...

AI Technical Summary

Problems solved by technology

[0005] In the traditional magnetic field gradient detection scheme, the detection information is carried by radio frequency signals or electrical signals, and the anti-electromagnetic interference ability is relatively poor, and the signals cannot be processed remotely;

Images