Patent ID: 8477315
Filing Date: 2013-07-02
Classification: G02B,G03H,H01S

Abstract:
1. A volume hologram comprising: an incidence surface onto which a first coherent light having a plurality of wavelengths is incident; and a plurality of interference fringes, each of the plurality of interference fringes having a plurality of streaks, wherein: each of the plurality of streaks covers substantially an entire area of the incidence surface; and generates a second coherent light comprised of a plurality of wavelengths not identical to that of the first coherent light; wavelengths of the plurality of wavelengths of the second coherent light generated from the plurality of streaks differ from each other; angles between the plurality of streaks and the incidence surface are different for each of the plurality of interference fringes, such that each of the plurality of interference fringes corresponds to one wavelength of the coherent light; the plurality of wavelengths of the second coherent light emits at least from a surface which differs from the incidence surface; and the first coherent light and the second coherent light travel in a substantially parallel direction.