Tuning the third-order nonlinear optical (NLO) properties of graphene (G) is of great significance in nonlinear optics. In this work, Cu₂Se/reduced graphene oxide (RGO) composites with different Cu₂Se contents were prepared via a solvothermal method. The structure and morphology indicated that the Cu₂Se nanoparticles were uniformly dispersed on the surface of the graphene nanosheets. The NLO properties of the composites with different Cu₂Se contents were investigated via the Z-scan technique with a picosecond-pulse laser at 532 nm. The results showed that the Cu₂Se/RGO composites had the properties of reverse saturated absorption (RSA) and positive nonlinear refraction, and their NLO properties could be effectively regulated by controlling the Cu₂Se contents. The third-order nonlinear susceptibility of the Cu₂Se/RGO composite with a 1.5:1 mass ratio of Cu₂Se to graphene oxide could reach 6.52 × 10⁻¹¹ esu, which increased five-fold compared to G. The introduction of Cu₂Se improved the NLO response of G, which might be attributed to the content effect of Cu₂Se in the composites and the synergistic effects stemming from charge transfer between the Cu₂Se and RGO This paper lays a foundation for the further study on the applications of the Cu₂Se/RGO composite materials in NLO devices.

调整石墨烯 (G) 的三阶非线性光学 (NLO) 特性在非线性光学中具有重要意义。在这项工作中，通过溶剂热法制备了具有不同 Cu ₂ Se 含量的Cu ₂ Se/还原氧化石墨烯 (RGO) 复合材料。结构和形貌表明Cu ₂ Se 纳米颗粒均匀地分散在石墨烯纳米片的表面。通过 Z 扫描技术和 532 nm 皮秒脉冲激光研究了具有不同 Cu ₂ Se 含量的复合材料的非线性光学特性。结果表明，Cu ₂Se/RGO复合材料具有反向饱和吸收（RSA）和正非线性折射特性，通过控制Cu ₂ Se含量可以有效调节其非线性光学特性。的Cu的三阶非线性极化率₂硒/ RGO复合用1.5：铜1质量比₂硒到氧化石墨烯可达到6.52×10 ^-11 ESU，这增加了五倍相比G.引入的Cu ₂硒提高G的NLO响应，这可能是由于Cu的含量效果₂硒在复合材料中，并从铜之间的电荷转移而产生的协同效果₂Se和RGO 本文为进一步研究Cu ₂ Se/RGO复合材料在非线性光学器件中的应用奠定了基础。