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- W4306409596 abstract "Abstract Strong second harmonic response and large birefringence of nonlinear optical (NLO) materials have important scientific and technical significance for tunable lasers. The second harmonic generation (SHG) response in NLO crystals has been generally enhanced by improving the polarization of bridged oxygen atoms or local structural distortions, while the synergy of the two contributions to enhance the SHG response is rarely explored. To this end, new crystals with traditional RbTiOPO 4 (RTP)‐structure, Rb 1– x Ti 1– x Sb x OPO 4 ( x = 0.01, 0.03, and 0.06), containing novel functional SbO 6 octahedra and Rb vacancies are designed through a one‐site aliovalent substitution and grown in this work. Rb 0.94 Ti 0.94 Sb 0.06 OPO 4 exhibits an enhanced SHG response, nearly 1.48 times that of the RTP crystal, accompanied by the largest birefringence in phosphates (exp. 0.202 at 546 nm, cal. 0.156 at 1064 nm). Theoretical calculations and crystal structure analysis confirm that the higher polarizability of bridged oxygen and the local structural distortions in Rb 1– x Ti 1– x Sb x OPO 4 strengthen the NLO activity of neighboring units, thus significantly prompt the SHG effect and optical anisotropy. This study provides a new paradigm to deeply improve the NLO performance of crystal materials and benefits for expanding their practical applications." @default.
- W4306409596 created "2022-10-17" @default.
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- W4306409596 date "2022-10-17" @default.
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- W4306409596 title "Enhancements of Second Harmonic Generation and Birefringence in Traditional RbTiOPO<sub>4</sub>‐Type Crystals by Aliovalent Substitution of Ti Site" @default.
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- W4306409596 doi "https://doi.org/10.1002/adom.202201643" @default.
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