| 摘要 |
PURPOSE:To miniaturize a device and to facilitate its manufacture, and also, to improve the reliability. CONSTITUTION:Light P1 from a semiconductor laser 4 arranged on a semiconductor substrate 1 so that the optical axis of the light P1 emitted from the semiconductor 4, and optical axes of light P2 and P3 reflected and allowed to transmit through by a prism 2 are not included in the same plane is reflected by the prism, and radiates, for instance, a magneto-optical disk (not shown in the figure). Subsequently, a reflected light P2' from the magneto-optical disk transmits through the prism 2, is reflected or allowed to transmit through by a polarizing optical film 21 formed on the face 2c of the prism 2 being in contact opposingly with the semiconductor substrate 1, subjected to optical path branch to a P polarization component or an S polarization component and received by a photodetecting part 11 or 12. |
