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Single-crystal structure diagram and SHG response of (2-Ampy)H2PO4 crystal.

Introducing electronegative species into organic constituents was considered to be one effective strategy for adjusting crystal symmetry and designing new nonlinear optical (NLO) materials. By substitution of C4 in piperidine (C

Organic-inorganic hybrid Pb-halide perovskites have attracted tremendous interest due to their potential application in photovoltaic and optoelectronic fields. However, the toxicity and poor stability of Pb-halide perovskites have become key bottlenecks toward their future commercialization and industrialization. Therefore, in this work, two novel hybrid lead-free perovskite nonlinear optical (NLO) crystals (2-AMP)

To design nonlinear optical (NLO) materials, we focused on combinations of d

For rapidly grown KDP crystal, the whole growth zone is composed of prismatic- and pyramidal-sector. In order to further understand the distinctions between them, KDP crystals doped with Fe3+ in trace amount were selected to explore the influences of metal cation with high-valence on growth characteristics, Optical quality and nonlinear refraction. The growth characteristics for as-grown crystals indicate that the growth rate of prismatic sector can be obviously inhibited by Fe3+ ions with less than 15 ppm due to the stronger electronegativity of (100) face. With the increase of Fe3+, the crystal and optical qualities show significantly lower trends, especially for the prismatic sector. The influence of Fe3+ ions on nonlinear refraction was observed by Z-scan technique, which shows that self-focusing effect could be caused in high-intensity laser system because of the nonlinear refractive index obtained with a positive sign. Specially, nonlinear refraction effects along II-type and z-cut in prismatic area both show a significant variation with increase of Fe3+, while a negligible effect on nonlinear refraction is proved for pyramidal sector. Additionally, the generation of nonlinear refraction is mainly attributed to the electron-cloud distortion of H2PO4− groups, and the changes in prismatic sector may be due to the existence of (FeO4)2- groups.