| 摘要 |
PURPOSE:To simplify constitution as a whole, by separating a return light beam from an optical recording medium to an optical detector side by using the optical rotary polarization characteristic of an acoustic optical polarizing element. CONSTITUTION:An incident light beam LB1 emitted from a light source 11 is made incident on the acoustic optical polarizing element 3 consisting of an anisotropic Bragg diffraction element by transmitting a polarization type beam splitter 21. Thus, a scanning light beam LB3 obtained by the circulation of a polarizing plane from the said acoustic optical polarizing element 3 by its diffracting function can be obtained, and the scanning light beam LB3 is projected on the optical recording medium 1. And by reflecting obtained return light beam LB4 by the beam splitter 21 after transmitting through the acoustic polarizing element 3, it is derived to the optical detector 15. In such a way, it is not required to provide a dedicated optical element to circulate the polarizing plane of the light beam separately, then, an optical information processor with simple constitution can be obtained. |
