Abstract
Photo-induced structural transformations in oriented Y-Ba-Cu-O films deposited on ZnSe single crystals were studied using two-photon absorption (TPA). The ZnSe single crystals were cut parallel to the crystallographic plane. The reversible changes of third-order nonlinear optical susceptibilities, particularly of two-photon absorption, were induced in the Cu-O in-plane and out-of-plane structural fragments after the first cycle of infrared photoexposure. The whole scheme of the photo-induced and thermo-induced transformations in the oriented Y-Ba-Cu-O films can be explained as created and annihilated defects during illumination. The density of vibration states calculated using quantum-chemical solid-state methods is in good agreement with experimental results. We show also the essential influence of the time delay between the probe and pump beams on two-photon absorption in Y-Ba-Cu-O films.
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