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Definition of "conical diffraction" |
a scattering phenomenon in photorefractive crystals in which the scattered beam forms a cone of light. When a laser beam of finite transverse cross section passes through a photorefractive crystal, beam fanning often occurs. The hologram formed by the incident beam and the fanned light consists of a multitude of gratings because the fanned light spans a wide solid angle in space. When such a multitude of gratings is read out by a laser beam, only a subset of these gratings matches the Bragg condition with readout beam. The wave vectors of the Bragg-matched readout beams form hollow cones in momentum space. Therefore, conical diffractions are observed most of the time when fanning occurs. Conical diffraction is also often referred to as conical scatterings. |
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