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Pure single crystals of ammonium dihydrogen phosphate (ADP) and crystals containing 1, 3, and 5[Formula: see text]mol% of itaconic acid (ITA) were generated by the slow evaporation of an aqueous solution. With the help of powder X-ray diffraction and Fourier transform infrared spectroscopy, we were able to show that doping puts a lot of stress on crystals. According to the of Vickers microhardness results, the addition of ITA causes the ADP to have a greater degree of abrasiveness. The SHG efficiency of ITA-doped ADP is greater than that of pure ADP. The presence of dopant was established using the energy-dispersive spectroscopy. The [Formula: see text]-scan method was used to investigate the third-order nonlinear optical characteristics of ITA–ADP crystals formed by the slow evaporation method on a variety of planes. A He–Ne laser with a wavelength of 632.8[Formula: see text]nm was used to carry out the investigation. The nonlinear absorption coefficient, nonlinear refractive index, and third-order nonlinear susceptibility of the ITA–ADP crystals were also plotted in detail. The piezoelectric charge coefficient of pure ADP is lower than that of the ITA-doped ADP. Analysis of the electro-optic investigation reveals lesser half-wave voltage of doped ADP.

We investigated the impact of itaconic acid (ITA) on potassium dihydrogen phosphate (KDP) aimed at concentrations of 1, 3, and 5 mol % on Single Crystal X-Ray Diffraction, Fourier Transform Infra-Red, absorption of optical charm, Powder XRD, improved second Harmonic Generation competency, and third order non-Linearity of fully grown solitary crystals formed by slow cooling (Low Temperature Solution Growth). The crystals were crushed into a powder with micron-sized crystals for X-ray diffraction research. The Powder XRD spectrum of different ITA doped KDP concentrations showed fewer peaks with higher intensities than pure KDP crystals. Doping in the KDP crystal matrix accelerate growth in the [200] plane. Despite vibration assignment modes of ITA doped KDP, the FT-IR spectrum shows doping materials in KDP crystalline media. ITA doped KDP showed 89% optical transmission in UV-Vis-NIR spectroscopy, whereas pure KDP possessed 55%. The dielectric investigation found that doped KDP crystals had lower dielectric loss and greater dielectric constants than pure counterparts. In pure and doped crystals, piezoelectric effects and second harmonics are premeditated. Using the Z scan approach, we were able to assess the third order nonlinear optical behaviour of pure crystal samples as well as the effects of self-defocusing caused by doping of ITA in KDP. ITA doping contributes to the growth, nucleation, and induction period. Doping concentration initially accelerated growth. Photoluminescence study shows that fully formed crystals have fewer defects. High Resolution XRD study determined crystal quality.

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