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磁光盘存贮以磁光克尔效应为基础，为有效地检测出读出光束中包含的偏振信息，用琼斯矢量分析方法，讨论了读取光束偏振态对磁光信号的影响，光学系统中双折射，振幅、位相特性与偏振态的关系。给出了光学系统的优化设计，采用高偏振性能光学元件，优化其光学参数，引入相位补偿，消除双折射，相移的影响，保证读光束高线偏振性，增大了读光束克尔旋转角，提高了系统的信噪比。
Based on the magneto-optic Kerr effect, magneto-optical disk storage is used to effectively detect the polarization information contained in the readout beam. The influence of the polarization state of the readout beam on the magneto-optical signal is discussed by Jones vector analysis. In the optical system Relationship between birefringence, amplitude, phase characteristic and polarization state. The optimal design of the optical system is given. The optical element with high polarization performance is used to optimize the optical parameters. The phase compensation is introduced to eliminate the influence of the birefringence and the phase shift. The polarization of the read beam is ensured and the Kerr rotation of the read beam is increased Angle, improve the system’s signal to noise ratio.