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- W3165781326 abstract "Strong anisotropy of photoluminescence of a (100)-cut β-Ga 2 O 3 and a Mg-doped β-Ga 2 O 3 single crystals was found in UV and visible spectral range, the bands of which were attributed to different types of transitions in the samples. Green photoluminescence in the Mg-doped sample was enhanced approximately twice. A remarkable enhancement of two-photon absorption and self-focusing in β-Ga 2 O 3 after doping was revealed by 340-fs laser Z-scanning at 515 nm. The absolute value of complex third order susceptibility χ (3) determined from the study increases by 19 times in [001] lattice direction. Saturable absorption and associated self-defocusing were found in the undoped crystal in the [010] direction, which was explained by the anisotropic excitation of F-centers on intrinsic oxygen defects. This effect falls out of resonance in the Mg-doped crystal. The χ (3) values which are provided by a decrease of bandgap in Mg-doped β-Ga 2 O 3 are χ (3) [001] = 1.85·10 −12 esu and χ (3) [010]= χ (3) yyyy = 0.92·10 −12 esu. Our result is only one order of magnitude lower than the best characteristic in green demonstrated by a Mg-doped GaN, which encourages subsequent development of Mg-doped β-Ga 2 O 3 as an effective nonlinear optical material in this region." @default.
- W3165781326 created "2021-06-07" @default.
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- W3165781326 date "2021-06-01" @default.
- W3165781326 modified "2023-10-12" @default.
- W3165781326 title "Anisotropic luminescence and third-order electric susceptibility of Mg-doped gallium oxide under the half-bandgap edge" @default.
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- W3165781326 doi "https://doi.org/10.1364/oe.427021" @default.
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