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Global Maxima of the Acousto-Optic Effect in CaWO₄ Crystals

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Andrushchak A., Buryy O., Demyanyshyn N., Hotra Z., Mytsyk B.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
928-932
EN
The global maxima of the acousto-optic interaction are theoretically determined for CaWO₄ crystals by extreme surfaces method. As it is shown, the highest value of the acousto-optic figure of merit M₂ is equal to 14.0×10¹⁵ s³/kg and achieved in the case of the diffraction of ordinary or extraordinary light beam on the slow quasi-transversal acoustic wave. At that the incident light wave propagates close to c-axis of the crystal and the corresponding acoustic wave propagates in the direction close to the perpendicular one.
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Study of Second Harmonic Generation in KDP/Al₂O₃ Crystalline Nanocomposite

100%
Andrushchak N., Kulyk B., Göring P., Andrushchak A., Sahraoui B.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
856-859
EN
Crystalline nanocomposite KDP/Al₂O₃ was obtained by growth of KDP nanocrystals inside nanopores of amorphous alumina matrix (Al₂O₃) with pores diameter of 35 nm. Performed atomic force microscopy and X-ray diffraction analysis confirmed that Al₂O₃ matrix is filled up with a tetragonal phase KDP nanocrystals in preferred crystallographic orientation [100]. The nonlinear optical response was studied by means of second harmonic generation via the Maker fringe technique employing picosecond laser pulses at wavelength of 1064 nm. The polarization dependent second harmonic generation response was observed mainly due to the macroscopic crystalline structure anisotropy of KDP/Al₂O₃ nanocomposite. The investigation of such type of nanocomposites which combine nanoscale nonlinear optical materials has a great importance since they may improve the performance of entire system.
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