title: Accurate control of a liquid-crystal display to produce a homogenized Fourier transform for holographic memories.
abstract: We show an accurate procedure to obtain a Fourier transform (FT) with no dc term using a commercial twisted-nematic liquid-crystal display. We focus on the application to holographic storage of binary data pages, where a drastic decrease of the dc term in the FT is highly desirable. Two different codification schemes are considered: binary pi radians phase modulation and hybrid ternary modulation. Any deviation in the values of the amplitude and phase shift generates the appearance of a strong dc term. Experimental results confirm that the calculated configurations provide a FT with no dc term, thus showing the effectiveness of the proposal.
authors.affiliation: Departamento de Física, Ingenierýa de Sistemas y Teoría de la Señal, Universidad de Alicante, Apartado 99, 03080, Alicante, Spain. Andres.Marquez@ua.es
authors.forename: Andrés
authors.initials: A
authors.lastname: Márquez
authors.forename: Sergi
authors.initials: S
authors.lastname: Gallego
authors.forename: David
authors.initials: D
authors.lastname: Méndez
authors.forename: Mariela L
authors.initials: ML
authors.lastname: Alvarez
authors.forename: Elena
authors.initials: E
authors.lastname: Fernández
authors.forename: Manuel
authors.initials: M
authors.lastname: Ortuño
authors.forename: Cristian
authors.initials: C
authors.lastname: Neipp
authors.forename: Augusto
authors.initials: A
authors.lastname: Beléndez
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Pascual