Herein, we report the extraction, characterization, linear and third-order nonlinear optical (TONLO) features of the natural pigment from Ocimum tenuiflorum leaves using different polar solvents. The polar solvents such as, ethanol, acetone, methanol and dimethyl sulfonate (DMSO) were used to extract the natural pigment from Ocimum tenuiflorum leaves. The effect of solvent on linear and TONLO properties of the natural pigment was studied and multi- parameter scale known as Kamlet-Abboud-Taft was used to analyse the solvent characteristics on solute molecule. The functional groups of the extracted natural pigments were examined via Fourier transform infrared (FT-IR) spectrometer. TONLO characteristics of the natural pigment was scrutinised by a continuous wave (CW) diode laser working at 650 nm wavelength. The nonlinear refractive index (n₂) and nonlinear coefficient of absorption (β) of the natural pigment was ascribed to the behavior of self-defocusing, saturable absorption (SA) and reverse saturable absorption (RSA). The TONLO susceptibility (χ⁽³⁾) of the natural pigment in polar solvents was found to be the order of 10^–6 esu. The natural pigment extracted from Ocimum tenuiflorum leaves is a potential material for applications in nonlinear optical.

在此，我们报告了使用不同极性溶剂从罗勒叶中提取的天然色素的提取、表征、线性和三阶非线性光学 (TONLO) 特征。采用乙醇、丙酮、甲醇和磺酸二甲酯（DMSO）等极性溶剂提取罗勒的天然色素树叶。研究了溶剂对天然色素的线性和TONLO性质的影响，并使用称为Kamlet-Abboud-Taft的多参数尺度来分析溶剂对溶质分子的特性。通过傅里叶变换红外 (FT-IR) 光谱仪检测提取的天然色素的官能团。通过在 650 nm 波长下工作的连续波 (CW) 二极管激光器仔细检查天然色素的 TONLO 特性。天然色素的非线性折射率 (n ₂ ) 和非线性吸收系数 (β) 归因于自散焦、可饱和吸收 (SA) 和反饱和吸收 (RSA) 行为。天然色素在极性溶剂中的 TONLO 敏感性 (χ ⁽³⁾ ) 被发现为 10 的数量级^–6埃苏。从罗勒叶中提取的天然色素是一种潜在的非线性光学应用材料。