Showing papers on "Organic photorefractive materials published in 2015"
TL;DR: In this paper, a series of sequential phase maps from recording digital holograms is used to explore the evolution of the photorefractive (PR) effect of electrooptic crystal under various situations.
Abstract: The dynamic refractive-index-change behavior of the light-induced process in an Mn:Fe:KTN crystal illuminated by a focused light sheet can be observed experimentally by digital holographic interferometry. By numerically retrieving a series of sequential phase maps from recording digital holograms, the spatial and temporal evolution of the light-induced refractive-index-change distribution inside the material is visualized in situ and monitored in a quantitative and in full field way. With this technique, the effect of recording parameters, such as writing laser power and polarization, bias voltage, temperature, and writing time, on the Mn:Fe:KTN crystal in the photorefractive effect can be explored. Therefore, optimized recording parameters will be achieved according to the dynamic behavior. The method provides an access to explore the evolution of the photorefractive (PR) effect of electrooptic crystal under various situations.
4 citations
TL;DR: In this paper, the phase shift between interference pattern and index grating in photorefractive materials affects the coupling between the input beams and hence changes the output, and the effect of this phase shift is analyzed on the redistribution of energy among higher diffraction orders.
TL;DR: In this paper, the propagation of a diffracted beam by a straight edge like initial condition in a photorefractive crystal under drift nonlinearity was studied and it was observed that the diffracted pattern and propagation is enhanced in the form of multiple waveguides.
Abstract: We show experimental results for the propagation of a diffracted beam by a straight edge like initial condition in a photorefractive crystal under drift nonlinearity. We have observed that the diffracted pattern and propagation is enhanced in the form of multiple waveguides.
TL;DR: In this paper, the existence of surface gratings associated with volume gratings in a photorefractive material is proved by analyzing reflected diffraction orders of an incident reading beam.
Abstract: Existence of surface gratings associated with volume gratings in a photorefractive material is proved by analyzing reflected diffraction orders of an incident reading beam. A novel technique is used to numerically eliminate the Fabry-Perot effect from the diffracted orders.
16 Jun 2015
TL;DR: In this article, the temporal dynamics of the Sn2P2S6 sample transmission were studied to reveal a sequence of processes that result in a desirable sensitization, and the effect of pre-exposure to visible light on the photorefractive response was investigated.
Abstract: : Pre-exposure of Sn2P2S6 to visible light gives rise to a temporary increase of the effective trap density and thereforeimproves the photorefractive response. With cw pre-exposure and nanosecond pulse pre-exposure we study temporal dynamics of the Sn2P2S6 sample transmission to reveal a sequence of processes that result in a desirable sensitization.