Growth and characterization of pure and doped KHP NLO single crystals

• 0.5% Doped l-lysine KHP crystals have high transparency.
• Similarly low dopant of KHP has high SHG efficiency.
• Functional groups from FTIR reveals the dopand in the crystal.
• Only lower dopant are superior when compared to pure and high dopants of l-lysine.
• This proves dopants of KHP crystals can be widely used for optical applications.

Single crystals of Potassium Hydrogen Phthalate doped with amino acid l-lysine were grown successfully by slow evaporation method. The concentration of dopant in the mother solution was 0.5 mol%, 1 mol% and 2 mol%. There is a drastic change in the morphology due to variation in doping rates which is also reflected in the X-ray diffraction data. The Fourier Transform infrared spectroscopy study confirms the incorporation of l-lysine into Potassium Hydrogen Phthalate crystal. The thermal study indicates the dissociating nature of the crystal. The nonlinear optical property of the grown crystal has been confirmed by Kurtz-powder second harmonic generation test. The dopant of 0.5 mol% and 1 mol% shows higher second harmonic generation result than pure Potassium Hydrogen Phthalate. Results are discussed.

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