Journal
OPTICS EXPRESS
Volume 29, Issue 12, Pages 18587-18600Publisher
Optica Publishing Group
DOI: 10.1364/OE.427021
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Funding
- National Natural Science Foundation of China [51972319]
- Strategic Priority Research Program of CAS [XDB16030700]
- CAS President's International Fellowship Initiative [2018PE0033, 2021VTB0003]
- Shanghai Science and Technology International Cooperation Fund [19520710200, 19520743900]
- Science and Technology Commission of Shanghai Municipality [19520744400]
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The study revealed strong anisotropy of photoluminescence in (100)-cut beta-Ga2O3 and Mg-doped beta-Ga2O3 single crystals in the UV and visible spectral range, with different types of transitions attributed to the observed bands. The Mg-doped sample exhibited enhanced green photoluminescence and increased two-photon absorption and self-focusing effects at 515 nm. The nonlinear optical properties of Mg-doped beta-Ga2O3 were found promising, encouraging further development in this area.
Strong anisotropy of photoluminescence of a (100)-cut beta-Ga2O3 and a Mg-doped beta-Ga2O3 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 beta-Ga2O3 after doping was revealed by 340-fs laser Z-scanning at 515 nm. The absolute value of complex third order susceptibility chi((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 chi((3)) values which are provided by a decrease of bandgap in Mg-doped beta-Ga2O3 are chi((3)) [001] = 1.85 .10(-12) esu and chi((3)) [010]=chi((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 beta-Ga2O3 as an effective nonlinear optical material in this region. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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