Writing saturated holograms in LiNbO3 crystals through phase control and double diffraction

Freschi, A. A.

doi:10.1007/s00340-009-3894-0

Cited by 1 publication

(1 citation statement)

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“…In any case, for feedback systems that allow stabilization at arbitrary phase values it is always possible to record a phase-locked hologram by setting properly the control phase of the system; see, for instance, typical regimes of phase-locked holograms recorded in LiNbO 3 crystals in Refs. [31,32]. For feedback systems that work only at fixed phase values such as u = 0 or p, another approach is to compensate the photovoltaic current by applying an external electric field opposite but equal in magnitude to the photovoltaic saturation field; in this case, only diffusion currents have to be taken into account for the generation of the hologram.…”

Section: Discussionmentioning

confidence: 99%

Sign of the dominant charge carriers in photorefractive crystals determined by a phase-locked holographic technique

et al. 2015

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a b s t r a c tThis work presents a holographic method based on active feedback techniques for determining the sign of the dominant charge carriers in photorefractive materials. A two-step procedure is proposed: first off a stationary phase-locked hologram is recorded; an electric field normal to the grating layers is then applied to the material, thus producing a running hologram. The sign of the charge carriers is determined by comparing the direction of the applied field with the direction of the hologram movement, which is known through the automatically attached light pattern. The method can be applied from highly photoconductive to highly insulating materials. Furthermore, no information on any material parameter is required. The method is validated by a set of holographic experiments using a Bi 12 TiO 20 crystal that has electrons as the majority photocarriers.

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Section: Discussionmentioning

confidence: 99%