| 摘要 |
<p>A method of producing an inline hologram lens is disclosed which includes the steps of, recording on a first photo-sensitive layer a holographic interference pattern which results from the simultaneous irradiation of the layer by a reference wave beam and a subject wave beam, the two beams being in off-axis with each other and the latter beam being perpendicular to the layer, forming an off-axis hologram lens by developing the first photo-sensitive layer, facing a second photo-sensitive layer to the off-axis hologram lens, irradiating the off-axis hologram lens by a reference wave beam for reproducing, irradiating simultaneously the second photo-sensitive layer perpendicularly by a reproduced subject wave beam as a subject from the off-axis hologram lens and a reference wave beam through the off-axis hologram lens, and developing the second photo-sensitive layer. An optical reproducing head is also described through which a laser beam from a laser source is irradiated to an optically recorded medium and through which a reflected beam from the record medium is led to a photo-detector. In this case, the optical reproducing head has a beam splitter, a quarter wave plate an inline hologram lens produced by the method described above, and a device for sticking the been splitter, the quarter wave plate and the inline hologram lens together by transparent adhesive.</p> |
