Journal ArticleDOI
Simple methods of measuring the net photorefractive phase shift and coupling constant.
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TLDR
The problem of beam coupling and diffraction in a material with a dynamically written grating for arbitrary input beams is solved and the beam coupling as a function of the photorefractive phase ø and coupling constant g when one beam is either sinusoidally phase modulated or ramped in phase is determined.Abstract:
We report measurements of the photorefractive phase shift and coupling constant of several photorefractive materials. We solve the problem of beam coupling and diffraction in a material with a dynamically written grating for arbitrary input beams. These solutions are used to determine the beam coupling as a function of the photorefractive phase φ and coupling constant g when one beam is either sinusoidally phase modulated or ramped in phase. Experimental results are obtained for LiNbO3, BaTiO3, and for paraelectric potassium lithium tantalate niobate as a function of applied electric field.read more
Citations
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Phase modulation in two-wave mixing for dynamically recorded gratings in photorefractive materials
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TL;DR: In this article, a moving grating technique is used to monitor the kinetics of the amplitudes and phases of the modulations of refractive index and absorption coefficients induced in a photosensitive material by exposure to a system of interference fringes.
References
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Journal ArticleDOI
A nonlinear coupled-wave theory of holographic storage in ferroelectric materials
TL;DR: In this article, a theory is presented that describes the time evolution of the diffraction properties of holographically formed thick phase gratings in ferroelectrics, particularly in iron-doped lithium niobate, based upon a model that relates the instantaneous electromagnetic fields in a grating to the refractive index in a manner consistent with the work of Young et al.
Journal ArticleDOI
Characterization of a new photorefractive material: Kl-yLyT1-xNx
TL;DR: In this paper, the growth and characterization of a new photorefractive material, potassium lithium tantalate niobate (KLTN), was reported and a KLTN crystal doped with copper was demonstrated to yield high diffraction efficiency of photore-fractive gratings in the paraelectric phase.
Journal ArticleDOI
Measurement of the photorefractive phase shift
TL;DR: The true spatial shift between the electro-optic grating and the optical intensity pattern is determined, and at small beam-crossing angles this spatial shift is strongly affected by a photogalvanic current in the crystal.
Journal ArticleDOI
Phase‐shift measurement in photorefractive holographic recording
TL;DR: In this paper, a simple direct method for measuring the interference pattern of a light-to-recorded hologram phase shift in photorefractive crystals is reported, which is used for studying the recording in Bi12SiO20 under an externally applied electric field.
Journal ArticleDOI
Measurement of phase shift of photorefractive gratings by a novel method
M.Z. Zha,P. Amrhein,Peter Günter +2 more
TL;DR: In this paper, the phase shift of the photorefractive phase grating with respect to the interference pattern was measured using no moving mechanical parts, and the results showed the strong influence of internal photovoltaic fields.