Abstract
Break-up of a cw 632.8 nm wavelength laser beam to regular optical patterns during propagation through a photorefractive iron doped lithium niobate (LN:Fe) crystal is demonstrated. The power of the laser beam is varied in the range of 0.02–10 mW and 4 and 10 mm lengths LN:Fe crystals are used in the experiments. Time evolution of the laser beam profile at the output face of the LN:Fe crystal showed the splitting of a Gaussian beam into two lobes and then formation of 2D micrometric scale regular optical patterns. The input beam power increase essentially speeds-up the regular optical pattern formation. Regular optical patterns with two-fold rotation symmetry induct the quasi-crystalline photonic structures in LN:Fe crystal. A physical model to explain the experimental results is discussed.
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ACKNOWLEDGMENTS
The author is grateful to Prof. Mathieu Chauvet, Prof. Fabrice Devaux (Institute FEMTO-ST, University of Franche-Comte, Besancon, France) and Dr. Rafael Drampyan (Institute for Physical Research, National Academy of Sciences of Armenia) for many and fruitful discussions of experimental results.
Funding
This work was supported by International Science and Technology Center (ISTC) Grant, Project A-2130. The author is grateful to Dr. Edvard Kokanyan for providing the LN:Fe crystals in the framework ISTC A-2130 Project.
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Translated by L.M. Tsarukyan
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Tsarukyan, L.M. Laser Beam Break-Up to Regular Optical Patterns and Refractive Structures Formation in a Photorefractive Lithium Niobate Crystal. J. Contemp. Phys. 56, 184–191 (2021). https://doi.org/10.3103/S1068337221030208
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DOI: https://doi.org/10.3103/S1068337221030208