Effect of beam attenuation on photorefractive grating erasure

Stabilized selective photorefractive holographic erasure

We report the selective erasure of a previously recorded 100% diffraction efficiency grating in a photorefractive lithium niobate crystal. Both the recording and the selective erasure are carried out using self-stabilized holographic recording techniques. The recording and the erasure are shown to be in excellent agreement with the proposed corresponding theoretical model. After erasure, a grat...

effect of oral presentation on development of l2 learners grammar

this experimental study has been conducted to test the effect of oral presentation on the development of l2 learners grammar. but this oral presentation is not merely a deductive instruction of grammatical points, in this presentation two hypotheses of krashen (input and low filter hypotheses), stevicks viewpoints on grammar explanation and correction and widdowsons opinion on limited use of l1...

Double grating formation in anisotropic photorefractive crystals

Double gratings form in anisotropic photorefractive crystals when two plane waves intersecting inside the crystal have both extraordinary and ordinary wave components. The effect can be observed by reading out the two gratings with extraordinary or ordinary light. Experiments confirm the theoretical predictions. The relevance of these results in using photorefractive crystals for holographic st...

Nonlinear grating interaction in photorefractive Bi12SiO20

the effect of explicit teaching of metacognitive vocabulary learning strategies on recall and retention of idioms

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