Journal ArticleDOI
Interference-term real-time measurement for self-stabilized two-wave mixing in photorefractive crystals.
TLDR
The real-time direct interference-term measurement for a two-wave-mixing experiment in photorefractive crystals comprises phase modulation of one of the interfering beams and synchronous detection of the first and second harmonics in the resulting output irradiance modulation.Abstract:
We report the real-time direct interference-term measurement for a two-wave-mixing experiment in photorefractive crystals. Knowledge of the interference term may provide information concerning diffraction efficiency, interference pattern-to-recorded hologram phase shift, and optical activity and anisotropic diffraction properties of these materials. This method comprises phase modulation of one of the interfering beams and synchronous detection of the first and second harmonics in the resulting output irradiance modulation. Simultaneous detection of both harmonics enables the measurement to be made even in strongly perturbed conditions, since one harmonic is used for measuring and the other is used for operating an active stabilization system. Experimental results for Bi12TiO20 are reported.read more
Citations
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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
Self-stabilized holographic recording in LiNbO3:Fe crystals
TL;DR: In this article, the authors describe the self-stabilized holographic recording in Fe-doped LiNbO 3 crystals reaching almost 100% diffraction efficiency using weak interfering beams of 514.5 nm wavelength, even for relatively low light pattern modulation values.
Journal ArticleDOI
Stabilized recording and thermal fixing of holograms in photorefractive lithium niobate crystals
TL;DR: In this article, interference of the recording beams using one crystal surface as a beamsplitter yields a signal for stabilization, and either one of the beams is periodically phase modulated and the beam-coupling signal is used for stabilization.
Journal ArticleDOI
Linear adaptive interferometers via diffusion recording in cubic photorefractive crystals
I. Rossomakhin,S. Stepanov +1 more
TL;DR: In this paper, a linear adaptive interferometer using diffusion holographic recording in cubic PRCs is proposed and experimentally demonstrated for BTO, which is designed for linear transformation of a highfrequency phase modulation of signal light beams (including those with complicated wavefronts) into the amplitude one, with a simultaneous suppression of slow phase drifts.
Journal ArticleDOI
Improvements of sensitivity and refractive-index changes in photorefractive iron-doped lithium niobate crystals by application of extremely large external electric fields
TL;DR: In this article, external electric fields of as much as 65 kV/mm reveal significant enhancement of refractive-index changes Δns and of photorefractive sensitivity S. Refractive index changes of up to Δns=11.5×10-4 and sensitivities as high as S=40 cm/J were measured.
References
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Journal ArticleDOI
Holographic storage in electrooptic crystals. i. steady state
TL;DR: In this paper, a non-linear theory of self-diffraction on the light induced grating of refractive index in electrooptic crystals is developed and the intensities of the diffracted beams, the diffraction efficiency, and the shape of the surfaces of equal index change are calculated analytically for saturation holograms.
Journal ArticleDOI
Photorefractive effects and light‐induced charge migration in barium titanate
TL;DR: In this paper, the authors proposed a new theoretical model for the light-induced migration of charges which mediates the photorefractive effect in barium titanate and other crystals, and the theoretical model predicts the observed dependences of these effects on (1) beam intensities, directions and polarizations, (2) crystal orientation, and (3) on an externally applied dc electric field.
Journal ArticleDOI
Coupled‐Wave Analysis of Holographic Storage in LiNbO3
D. L. Staebler,J. J. Amodei +1 more
TL;DR: In this article, two effects for directly studying thick phase holograms were considered: coupling between the two laser beams used to record a hologram and interference between a readout beam and the diffracted beam within the hologram.
Journal ArticleDOI
Diffraction efficiency and energy transfer in two-wave mixing experiments with Bi 12 SiO 20 crystals
TL;DR: In this paper, the diffraction efficiency and energy transfer in photorefractive Bi12SiO20 (BSO) crystals were investigated and the optimum crystallographic orientation for each effect was determined for vertical polarization of the recording beams.
Journal ArticleDOI
Analysis of an active stabilization system for a holographic setup.
TL;DR: The use of the open loop response of the stabilization system is developed for analyzing its performance, which allows closer insight into parameters limiting Its behavior.