2002
DOI: 10.1117/12.452742
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<title>Transversely excited liquid crystal cells</title>

Abstract: The integration of photorefractive liquid crystal beam coupling devices into optical systems is often hampered by the need to tilt the liquid crystal cells to high angles of incidence in order to obtain efficient beam coupling. Owing to poor charge diffusion in most liquid crystal systems, charge migration depends mainly on an externally applied drift field. Conventional cells, with electrodes applied to the surfaces of the windows, therefore need to be tilted with respect to the incident light to enable a com… Show more

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“…For most photorefractive applications an electric field must be applied along the direction of the optical grating k-vector because the charge migration process in LCs is dominated by drift. If this field is applied to the ITO-electrodes, then (unless transverse electrodes are used [10]) the whole cell must be angled with respect to the grating k-vector so that a component of the applied field is parallel to the k-vector (see figure 1). Consequently only a part of the applied field induces charge migration.…”
Section: Introductionmentioning
confidence: 99%
“…For most photorefractive applications an electric field must be applied along the direction of the optical grating k-vector because the charge migration process in LCs is dominated by drift. If this field is applied to the ITO-electrodes, then (unless transverse electrodes are used [10]) the whole cell must be angled with respect to the grating k-vector so that a component of the applied field is parallel to the k-vector (see figure 1). Consequently only a part of the applied field induces charge migration.…”
Section: Introductionmentioning
confidence: 99%