Nonlinear optical (NLO) materials are crucial candidates for growing optical technologies as they can broaden the range of wavelengths achieved by common laser sources. However, the essential requirements for a real-life NLO material are precise. Here, we reported a simple chemical method used to prepare pure copper sulfide (CuS) and its composite with silver sulfide (Ag₂S) at room temperature by changing the concentration of Ag source. Their structural properties, UV–Vis absorption and photoluminescence properties were studied thoroughly, and the optical limiting ability is investigated by employing open aperture Z-scan technique with 532 nm laser pulses (10 ns, 10 Hz). We optimized the wt% of AgNO₃ content for which the composite CuS/Ag₂S(6) shows the highest third-order nonlinear response. These results suggest that the composite sample can be used as a promising material to design high-quality optical limiters by varying the concentration of constituent nanoparticles. Additionally, the photocatalytic experiment is performed for pure CuS and CuS/Ag₂S(9) composite, using their strong visible absorption properties.

非线性光学 (NLO) 材料是发展光学技术的重要候选材料，因为它们可以拓宽普通激光源实现的波长范围。然而，现实生活中 NLO 材料的基本要求是精确的。在这里，我们报道了一种简单的化学方法，用于通过改变银源的浓度在室温下制备纯硫化铜 (CuS) 及其与硫化银 (Ag ₂ S) 的复合物。对它们的结构特性、UV-Vis 吸收和光致发光特性进行了深入研究，并通过采用 532 nm 激光脉冲（10 ns，10 Hz）的开孔 Z 扫描技术研究了光学限制能力。我们优化了复合材料 CuS/Ag ₂中 AgNO ₃含量的 wt%S(6) 显示最高的三阶非线性响应。这些结果表明，复合样品可作为一种很有前途的材料，通过改变组成纳米粒子的浓度来设计高质量的光学限制器。此外，光催化实验是对纯 CuS 和 CuS/Ag ₂ S(9) 复合材料进行的，利用它们强烈的可见光吸收特性。