The application of laser in the measuring of kerr hysteresis loop

This thesis introduces a measuring method of the kerr hysteresis loop of the magneto-optical material by means of a He-Ne laser.In the optical system of our device,a magneto-optical thin film is used as a polarization rotation angle compensator and as amodulator.The microcomputer is used to collect the measured data and process them,The measurement results are printed out finally.The automatic measurement of the hysteresis loop is realized.