All-optical technique is an effective method to breakthrough the speed limitation of electric devices. Due to the strong nonlinear optical properties, two-dimensional materials have been concerned. As a potential nonlinear two-dimensional material, SnSe has been applied in the field of ultrafast laser generation. The measurement of nonlinear refractive index of SnSe and its nonlinear application is rare. In this paper, SnSe nanosheets are fabricated by a facial Li intercalation-assisted liquid exfoliation method. The nonlinear optical parameters are measured by the Z-scan technology. The SnSe-coated microfiber acted as a nonlinear device to achieve an all-optical switch and an all-optical AND gate. The wavelength-tuning and long-term stability results confirm that SnSe materials are excellent nonlinear optical medium. It is anticipated that SnSe has potential applications in nonlinear photonics devices toward high-performance all-optical signal processing.

全光技术是突破电子设备速度限制的有效方法。由于具有很强的非线性光学特性，二维材料一直受到关注。作为一种潜在的非线性二维材料，SnSe 已应用于超快激光产生领域。SnSe 的非线性折射率的测量及其非线性应用很少见。在本文中，SnSe 纳米片是通过面部 Li 嵌入辅助液体剥离方法制造的。非线性光学参数通过Z-scan技术测量。SnSe 涂层微纤维充当非线性器件，以实现全光开关和全光与门。波长调谐和长期稳定性结果证实 SnSe 材料是优良的非线性光学介质。