| 摘要 |
PROBLEM TO BE SOLVED: To provide a high numerical aperture optical system using an SIL further heightening the numerical aperture in an optical system miniaturizing a spot size and to provide an optical head for magneto-optical use provided with the high numerical aperture optical system. SOLUTION: This optical system is provided with an least an objective lens 1 and a solid immersion lens 2, and the solid immersion lens 2 is formed with a refractive index distribution type lens made to have a high numerical aperture, and further, the optical head for magneto-optical use obtaining information by reflecting an irradiation beam from a light source with a recording surface of a recording medium and converging the beam having the information on the recording surface through the optical system is constituted of this optical system. |
