Broadband dynamic, holographically self-recorded, and static hexagonal scattering patterns in photorefractive KNbO3:Fe

We have observed and explained three types of hexagon pattern formation in photorefractive crystal KNbO 3 :Fe. These are: (1) dynamic (laser induced), (2) semipermanent (holographically stored), (3) permanent (induced by a static domain grid) over a wide wavelength range.

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