| 摘要 |
<p>A light source unit, an optical detection unit, an optical head, an optical driver, and an information processing apparatus are provided to minimize effects of wavelength variation and output a plurality of lights stably, using volume hologram elements corresponding to a plane hologram element even if at least one of the lights emitted from a plurality of light sources is changed in wavelength. A light source unit(23A) for outputting a plurality of light beams comprises a plurality of light sources(LD1,LD2,LD3), a plane hologram element(PH1), and a plurality of volume hologram elements(VH1,VH2,VH3). The plane hologram element is provided on the optical paths of the light beams emitted from the light sources to diffract the light beams. The volume hologram elements, corresponding to the light sources, and are provided on the optical paths of the light beams traveling from the light sources to the volume hologram elements via the plane hologram element. Each volume hologram element diffracts the light from each corresponding light source.</p> |
