| 摘要 |
PURPOSE:To simplify the structure of a reproducer by using a magneto-optical recording medium and also using a polarized beam splitter to the reproducer. CONSTITUTION:A recording medium M showing an asymmetric Kerr effect contains a glass substrate K having a refractive index (n) of 1.52, an MnBi vertically magnetized film of 1,000Angstrom thickness used as a non-record layer A, a CdTbFe vertically magnetized film of 150Angstrom thickness used as a record layer C, ZrO2 having lambda (lambda=6,328Angstrom ) thickness used as an interference layer D, an adhesive Ad' having refractive index (n) of 1.52, and another glass substrate K. An (s) polarized beam is made incident to a thin film type PBS2 serving as a polarized beam splitter RBS, and this beam is reflected by 100% and is made incident approximately vertical on the medium M with its course bent by 90 deg.. This beam receives an asymmetric Kerr effect in response to the magnetizing direction of the beam irradiated part and is reflected. Only the P component (vector OS'1 or OS'2 in the figure) of the reflected light is transmitted through a PBS, and the S component is reflected toward a light source 1. The P component is reproduced to electric signals by a photoelectric transducer 3. |
