| 摘要 |
PURPOSE:To manufacture an in-line hologram lens easily by irradiating a spherical wave beam via an optical element as an object wave beam together with a diffracted wave beam as a reference wave beam to a hologram medium. CONSTITUTION:A laser beam is made to a divergent spherical wave beam by using a lens, and this beam is entered to a mother lens L1 to make a spherical wave beam having no aberrations. This is irradiated as a recording object wave beam A via a hologram DG to the photosensitive layer K of a hologram recording medium HR1 in such a manner that its optical axis X aligns the normal of the plane wave hologram DG and the medium HR1. Further, the laser beam is turned to a different direction, after which it is made to a reconstruction reference wave beam B' in such manner that its optial axis X' assumes an angle theta to the optical axis X. This beam is irradiated to the hologram part HL of the layer K, and the reconstruction object wave beam from the hologram DG is irradiated as recording reference wave beam B to the layer K. Thereby, the in-line hologram part HL of a circular shape is formed in the center of the layer K, and after development, an in-line hologram lens IN-L is made. |
