KDP (Potassium dihydrogen phosphate) single crystals were grown from Amaranth dye and EDTA (Ethylenediaminetetraacetic acid disodium salt) mixed KDP solutions by the temperature lowering method and Sankaranarayanan-Ramasamy technique. The molar concentration of EDTA in the solutions was 1 mol%. The Amaranth concentrations were 0.001, 0.005, 0.01, 0.03 and 0.05 mol%. The growth of KDP crystals was oriented in type I and type II phase-matching directions which bring maximum second harmonic generation (SHG) efficiency to the crystals. Optical properties of Amaranth and EDTA co-doped KDP crystals (KAE) were investigated by Ultraviolet-Visible (UV-Vis) spectroscopy, FT-Raman spectroscopy, and photoluminescence. SHG efficiency of the crystals was measured by shining 1064 nm Nd:YAG laser directly into them and receiving output signals. The most important result in the study showed that KAE crystals had SHG efficiency of 1.7 and 2.4 times higher than EDTA doped KDP crystal (KE) and pure KDP crystal respectively. Then second-order nonlinear optical coefficients of these crystals were calculated. The simultaneous doping of two organic substances into KDP crystals has further enhanced their nonlinear optical characteristics.

中文翻译：

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苋菜红和 EDTA 共掺杂 KDP 晶体的生长、紫外-可见光、振动、光致发光和二次谐波产生研究

KDP（磷酸二氢钾）单晶由苋菜红染料和EDTA（乙二胺四乙酸二钠盐）混合KDP溶液通过降温法和Sankaranarayanan-Ramasamy技术生长。溶液中 EDTA 的摩尔浓度为 1 mol%。苋菜红浓度为 0.001、0.005、0.01、0.03 和 0.05 mol%。KDP 晶体的生长方向为 I 型和 II 型相位匹配方向，这为晶体带来了最大的二次谐波产生 (SHG) 效率。通过紫外-可见 (UV-Vis) 光谱、FT-拉曼光谱和光致发光研究了苋菜红和 EDTA 共掺杂 KDP 晶体 (KAE) 的光学性质。通过将 1064 nm Nd:YAG 激光直接照射到晶体中并接收输出信号来测量晶体的 SHG 效率。研究中最重要的结果表明，KAE 晶体的 SHG 效率分别比 EDTA 掺杂的 KDP 晶体 (KE) 和纯 KDP 晶体高 1.7 倍和 2.4 倍。然后计算这些晶体的二阶非线性光学系数。将两种有机物质同时掺杂到 KDP 晶体中进一步增强了它们的非线性光学特性。