Optical element, the optical pickup and optical information recording reproducing apparatus

The optical element 10, the spherical aberration correction hologram 20 is formed. Largest effective diameter required for the first laser beam, the hologram does not affect the wavefront. On the other hand, the second laser beam larger effective diameter is required in the second, the spherical aberration is corrected by the concentric and zonal hologram 21 and the hologram 22 to form the hologram, the effective diameter is narrowed down. Also, the required third laser beam effective diameter is smallest being, only the hologram 22 has a correction effect of the spherical aberration. The hologram 22 has a diameter of, is associated with the effective diameter required for the third laser light, together with that diffused light incident effective diameter of the third laser beam is narrowed.