With the development of optical communication and information processing technology, magneto-optical materials would be widely applied in fields of optical communication, magneto-optical (MO) storage, strong absorbing of infrared and electromagnetic wave, ets.

The quantum transition model was infromed from and the mechanism ofmagneto-optical effect improving in quantum dots magneto-optical materials was got.

In recent years, with the development of laser, computer, information, and optical fiber communication, various magneto-optical materials, including magneto-optical glass, film, magnetic liquid, photonics crystal and liquid crystal materials have been developing speedly.

The developments and present situation of magneto-optical materials, especially about rare earth (RE) iron garnets, were reviewed.

Research on mechanism of magneto-optical effect improving in quantum dots magnto-optical materials;

The influence of the spin-orbit coupling on the magneto-optical effects in Nd:YIG;

Quantum theory of the magneto-optical effect of Nd-substituted yttrium iron garnet;

Analysis of the effect of magneto-optic effect on BB84 protocol;

With the method of Jones matrix,formulas for intensity of transmitted light through the optical analyzer of various composition of electro-optic effect with magneto-optic effect are derived.

To improve the accuracy, anti-interference capability and adaptability of high-direct-current measurement, a novel method based on Faraday magneto-optic effect, angle-comparison technology and removable magnetic structure with air-gap is presented.