Optical Isolator Magnet

The optical isolator is an optical component which allows the transmission of light in only one direction. It can be used to prevent reflected light feedback into the optical device. Optical isolator has been widely used in optical communication and laser field. The optical isolator mainly exploited the Faraday Effect of the magneto-optic crystal, and the Faraday Effect is a kind of magneto-optic effect.

What is magneto-optical effect?
The magneto-optical effect refers to the effect of the strong magnetic field to the interaction between matter and light. The electromagnetic wave will generate several phenomena when propagate through the medium that has been altered by the presence of the quasi static magnetic field. The common magneto-optical effect includes:

Faraday Effect: can be applied to optical isolator and optical circulator.
Kerr Effect: can be applied to the camera shutter.
Zeeman Effect: can be applied to the measurement of specific charge-to-mass ratio and celestial body magnetic field.
What is Faraday Effect?
Faraday Effect refers to the interaction between the optical wave in the medium and magnetic field. The polarization of polarized light will be changed by the action of the magnetic field.

Optical Isolator Magnet

Optical Isolator Magnet

Faraday Effect has been widely used in measuring apparatus, such as optical rotation, amplitude modulation and remote sensing of the magnetic field.

The operating principle of the optical isolator base on the nonreciprocity of Faraday rotation. The main part of the optical isolator is the so-called Faraday rotator. The Faraday rotator consists of Terbium Gallium Garnet (TGG) magneto-optical crystal and high performance permanent magnet.

The magneto-optical crystal needs to apply the suitable magnetic field. The permanent magnet should provide enough magnetic field in the space of magneto-optical crystal, then the cost can be reduced through the decrease of crystal. Both SmCo magnet and NdFeB magnet can be served as the optical isolator magnet.

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