Opt Lett. 2014 Jan 15;39(2):383-5. doi: 10.1364/OL.39.000383.
We demonstrate the application of two-dimensional materials for ultrashort optical pulse characterization. Monolayer transition metal dichalcogenides, such as tungsten disulfide (WS₂), possess extraordinarily large second-order nonlinear susceptibility, and due to their atomic thickness, have relaxed phase-matching requirements and, hence, an inherently wide bandwidth. Synthesized monolayer WS₂ triangular islands were used to characterize ultrashort optical pulses at the focal point of an objective lens through second-harmonic generation collinear frequency-resolved optical gating.
我们展示了二维材料在超短光脉冲特性分析中的应用。单层过渡金属二卤化物，如二硫化钨（WS₂），具有非常大的二阶非线性极化率，而且由于其原子层厚度，放宽了相位匹配要求，从而具有内在的宽带宽。我们通过二次谐波产生共线频率分辨光门技术，使用合成的单层 WS₂三角形岛来对物镜焦平面处的超短光脉冲进行特性分析。
