Angle-dependent diffraction efficiency in a thick photorefractive hologram.

The diffraction from a thick photorefractive hologram is shown to be angular dependent, which originates mainly from the angle-dependent effective electro-optic coefficient of a photorefractive crystal. The angle dependency of the diffraction causes a nonuniform diffraction over the pixel positions or the spatial frequency contents of a hologram image in a page-oriented holographic system, resulting in a deteriorated reconstructed image. In addition, owing to the angular variations in diffraction, the wavelength-multiplexing scheme should be a better choice than angular one.

[1]  G. D. Boyd,et al.  OPTICALLY‐INDUCED REFRACTIVE INDEX INHOMOGENEITIES IN LiNbO3 AND LiTaO3 , 1966 .

[2]  D. Brady,et al.  Adaptive optical networks using photorefractive crystals. , 1988, Applied optics.

[3]  C Gu,et al.  Scattering due to randomly distributed charge particles in photorefractive crystals. , 1991, Optics letters.

[4]  A Yariv,et al.  Optical data storage using orthogonal wavelength multiplexed volume holograms. , 1992, Optics letters.

[5]  L Hesselink,et al.  Alleviation of image distortion due to striations in a photorefractive medium by using a phase-conjugated reference wave. , 1992, Optics letters.

[6]  F. Mok,et al.  Storage of 500 high-resolution holograms in a LiNbO(3) crystal. , 1991, Optics letters.

[7]  Y. Fainman,et al.  Optimal coherent image amplification by two-wave coupling in photorefractive BaTiO3 , 1986 .

[8]  Lambertus Hesselink,et al.  Nonlinear photorefractive response at high modulation depths , 1988 .

[9]  H. Kogelnik.  Coupled wave theory for thick hologram gratings , 1969 .

[10]  Alastair M. Glass,et al.  High‐voltage bulk photovoltaic effect and the photorefractive process in LiNbO3 , 1974 .

[11]  Marvin B. Klein,et al.  Optimal Properties Of Photorefractive Materials For Optical Data Processing , 1983, Photonics West - Lasers and Applications in Science and Engineering.

[12]  Multibeam coupling in photorefractive SBN:Ce. , 1988, Optics letters.

[13]  Baruch Fischer,et al.  Photorefractive waveguides and nonlinear mode coupling effects , 1989 .

[14]  D. Staebler,et al.  HOLOGRAPHIC STORAGE IN DOPED BARIUM SODIUM NIOBATE (Ba2NaNb5O15) , 1971 .

[15]  Feng Zhao,et al.  Anisotropic intrasignal coupling in photorefractive linbo3 , 1994 .

[16]  Francis T. S. Yu,et al.  Wavelength multiplexed holographic storage in a sensitive photorefractive crystal using a visible-light tunable diode laser , 1993 .

[17]  D Psaltis,et al.  Nonvolatile storage in photorefractive crystals. , 1994, Optics letters.