Magnetic rotation assembly capable of adjusting magnetic field and optical isolator

Abstract

The invention is suitable for the field of lasers and provides a magnetic rotation assembly capable of adjusting a magnetic field. The magnetic rotation assembly comprises at least one group of magnetic ring arrays. Each group of magnetic ring arrays comprises a first magnetic ring, a second magnetic ring and a third magnetic ring. The first magnetic ring, the second magnetic ring and the third magnetic ring of each group of magnetic ring arrays are stacked up in an axial direction and fixed. At least one Faraday device is arranged in a central hole of each magnetic ring array and fixed. The direction of a first magnetic line of each first magnetic ring is a radial direction pointing towards the outside from the center. The direction of a second magnetic line of each second magnetic ring points towards the axial direction from the left to the right. The direction of a third magnetic line of each third magnetic ring is a radial direction pointing towards the center from the outside. By adjusting axial distances or up-down distances among each first magnetic ring, each second magnetic ring and each third magnetic ring, an adjustment can be made to the magnetic field. The invention further discloses an optical isolator. Therefore, the magnetic rotation assembly capable of adjusting the magnetic field and the optical isolator helps to save cost and ensures ideal angle of rotation by making an adjustment to the magnetic field.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a magnet optical rotation assembly and an optical isolator with an adjustable magnetic field. Background technique [0002] The isolator is an optical device suitable for the output of high-power lasers on a large scale, which effectively avoids the influence of the return beam on the laser beam processing surface. In the design of the isolator, a specific rotation angle is usually generated by combining a strong magnet with a Faraday device, so that the loss of the beam in the reverse direction is large, that is, high isolation. Here, the Faraday device is mainly used to rotate the light vector direction of the beam at a certain angle under a specific magnetic field. The following formula is usually used to characterize this characteristic: θ=VBL, where V is the Verdet constant, B is the magnetic induction, L is the length of the Faraday crystal, and θ is the light vector produced by the ...

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Problems solved by technology

However, this structure will increase the distance between the upper and lower magnet components due to the thickness of the Faraday crystal. At this time, the front and rear parts of the Faraday crystal cannot be surrounded by magnets, and the magnetic field is weakened.

In order to e

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