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Article Abstract
Materials with excellent nonlinear optical properties are critical for advancing optoelectronic technologies, particularly in energy storage and ultrafast photonic devices. High-entropy perovskite oxides (HEPOs) have emerged as promising candidates due to their chemical stability and configurational complexity. In this work, HEPO thin films, ()(), were fabricated using the pulsed-laser deposition technique. The effects of configurational entropy-driven lattice distortion and multication synergy at both A- and B-sites on the third-order nonlinear optical response were systematically investigated. The optical transmission spectra in the visible-near infrared region were measured to demonstrate that the transparency of the films gradually increases with the increasing B-site Sn doping concentration. Z-scan measurements revealed that the optimized sample with =0.5 exhibited a large third-order nonlinear susceptibility (=1.36×10), accompanied by a record figure of merit (/=1.37×10⋅). These results highlight the superior nonlinear optical performance of HEPOs, providing a foundation for practical applications in optical switches, optical limiters, and other optoelectronic devices.
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