Abstract
To investigate the effect of birefringence on noise, we studied the noise in magneto-optical media by means of alternating phase difference of the optical head. We examined the effect of a tilted ellipsoid near the bottom of the substrate in the vicinity of the groove, and the effect of vertical birefringence and a beam illuminating the disk in which the groove was molded. As a result, we found that the MO media noise was caused by irregularity of the groove shape and by elliptic polarization of the vertical birefringence.
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