Abstract
We have obtained the significant enhancement (up to 70 %) of the second harmonic generation efficiency in the novel composite material based on KDP single crystalline matrix with incorporated anatase nanoparticles under the mode-locked YAG:Nd laser pulsed excitation. The effect is explained by the internal self-focusing at moderate pump peak intensity due to giant cubic nonlinear optical response of anatase nanoparticles. The possibility to control quadratic and cubic nonlinear optical responses with selection of the nanoparticles concentration and growth sector of the crystal was shown. The nonlinear optical refractive index variation is a very sensitive tool to perform the diagnostics of the KDP and KDP:TiO2 single crystals within CW and pulsed picosecond range laser radiation due to the resonant excitation of the transient intrinsic defect states of the crystal matrix and surface states at the anatase nanoparticles interface.
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Acknowledgments
The authors are grateful to A. Kosinova for the KDP SC characterization, A. Shkurinov and V. Timoshenko for fruitful discussions, A. Uklein for the assistance in manuscript preparation. The work was partially supported by the NASU 1.4.1 B/141 project, M/312-2012 and CRDF # UKE2-7073-KK-12 grants.
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Gayvoronsky, V.Y., Kopylovsky, M.A., Brodyn, M.S., Popov, A.S., Yatsyna, V.O., Pritula, I.M. (2013). Interplay of Quadratic and Cubic Nonlinear Optical Responses in KDP Single Crystals with Incorporated TiO2 Nanoparticles. In: Fesenko, O., Yatsenko, L., Brodin, M. (eds) Nanomaterials Imaging Techniques, Surface Studies, and Applications. Springer Proceedings in Physics, vol 146. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7675-7_24
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DOI: https://doi.org/10.1007/978-1-4614-7675-7_24
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